I followed 3162's instructions, and managed to delete nail.exe in the DOS wondow, but couldn't delete the other file because it was being "used by another process".
Both files showed up in HJT and I fixed them but they were back again after reboot.
Then I follwed Chris's instructions, ran the killnail.bat file and got the following text:
C:\Documents and Settings\anna\Desktop>cd\
C:\>CD WINNT
C:\WINNT>dir C:\WINNT\Nail.exe
Volume in drive C has no label.
Volume Serial Number is B4B1-BE7C
Directory of C:\WINNT
15/04/2005 16:48 71,168 Nail.exe
1 File(s) 71,168 bytes
0 Dir(s) 1,513,877,504 bytes free
C:\WINNT>del C:\WINNT\Nail.exe
C:\WINNT>CD winnt\system32
The system cannot find the path specified.
C:\WINNT>dir c:\WINNT\system32\vxztlx.exe
Volume in drive C has no label.
Volume Serial Number is B4B1-BE7C
Directory of c:\WINNT\system32
04/12/2003 16:24 76,288 vxztlx.exe
1 File(s) 76,288 bytes
0 Dir(s) 1,513,951,232 bytes free
C:\WINNT>del c:\winnt\system32\vxztlx.exe
c:\winnt\system32\vxztlx.exe
The process cannot access the file because it is being used by another process.
C:\WINNT>pause
Press any key to continue . . .
HJT log:
Logfile of HijackThis v1.99.1
Scan saved at 17:03:09, on 15/04/2005
Platform: Windows 2000 SP4 (WinNT 5.00.2195)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)
Running processes:
C:\WINNT\System32\smss.exe
C:\WINNT\SYSTEM32\winlogon.exe
C:\WINNT\system32\services.exe
C:\WINNT\system32\lsass.exe
C:\WINNT\system32\svchost.exe
C:\WINNT\system32\spoolsv.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgamsvr.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
C:\Program Files\Belkin\Bluetooth Software\bin\btwdins.exe
C:\WINNT\System32\svchost.exe
C:\WINNT\system32\regsvc.exe
C:\WINNT\system32\MSTask.exe
C:\WINNT\System32\WBEM\WinMgmt.exe
C:\WINNT\system32\svchost.exe
C:\WINNT\Explorer.exe
C:\Program Files\Logitech\iTouch\iTouch.exe
C:\WINNT\system32\spool\drivers\w32x86\3\hpztsb07.exe
C:\PROGRA~1\COMMON~1\PCSuite\DATALA~1\DATALA~1.EXE
c:\winnt\system32\epovre.exe
C:\PROGRA~1\Nokia\NOKIAP~1\TRAYAP~1.EXE
C:\Program Files\Java\jre1.5.0_01\bin\jusched.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgemc.exe
F:\Programs\BullGuard 5.0\bullguard.exe
C:\Program Files\Belkin\Bluetooth Software\BTTray.exe
c:\PROGRA~1\COMMON~1\PCSuite\Services\SERVIC~1.EXE
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\PROGRA~1\Belkin\BLUETO~1\BTSTAC~1.EXE
F:\Programs\HJT\HijackThis.exe
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.yahoo.co.uk/
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.yahoo.co.uk/
F2 - REG:system.ini: Shell=Explorer.exe C:\WINNT\Nail.exe
O2 - BHO: Yahoo! Companion BHO - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\Program Files\Yahoo!\Companion\Installs\cpn\ycomp5_5_7_0.dll
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINNT\System32\msdxm.ocx
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn\ycomp5_5_7_0.dll
O4 - HKLM\..\Run: [zBrowser Launcher] C:\Program Files\Logitech\iTouch\iTouch.exe
O4 - HKLM\..\Run: [HPDJ Taskbar Utility] C:\WINNT\system32\spool\drivers\w32x86\3\hpztsb07.exe
O4 - HKLM\..\Run: [NeroCheck] C:\WINNT\system32\\NeroCheck.exe
O4 - HKLM\..\Run: [DataLayer] c:\PROGRA~1\COMMON~1\PCSuite\DATALA~1\DATALA~1.EXE
O4 - HKLM\..\Run: [PCSuiteTrayApplication] c:\PROGRA~1\Nokia\NOKIAP~1\TRAYAP~1.EXE
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\jre1.5.0_01\bin\jusched.exe
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\Grisoft\AVGFRE~1\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [AVG7_EMC] C:\PROGRA~1\Grisoft\AVGFRE~1\avgemc.exe
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [Synchronization Manager] mobsync.exe /logon
O4 - HKLM\..\Run: [gcasServ] "f:\Programs\Microsoft AntiSpyware\gcasServ.exe"
O4 - HKLM\..\Run: [fyvamr] c:\winnt\system32\epovre.exe
O4 - HKCU\..\Run: [Yahoo! Pager] C:\PROGRA~1\Yahoo!\MESSEN~1\ypager.exe -quiet
O4 - HKCU\..\Run: [BullGuard 5.0] "F:\Programs\BullGuard 5.0\bullguard.exe"
O4 - HKCU\..\Run: [LDM] \Program\BackWeb-8876480.exe
O4 - Global Startup: BTTray.lnk = C:\Program Files\Belkin\Bluetooth Software\BTTray.exe
O4 - Global Startup: Logitech Desktop Messenger.lnk = C:\Program Files\Logitech\Desktop Messenger\8876480\Program\LDMConf.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office\OSA9.EXE
O6 - HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel present
O8 - Extra context menu item: &Yahoo! Search - file:///C:\Program Files\Yahoo!\Common/ycsrch.htm
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O8 - Extra context menu item: Send To &Bluetooth - C:\Program Files\Belkin\Bluetooth Software\btsendto_ie_ctx.htm
O8 - Extra context menu item: Yahoo! &Dictionary - file:///C:\Program Files\Yahoo!\Common/ycdict.htm
O8 - Extra context menu item: Yahoo! &Maps - file:///C:\Program Files\Yahoo!\Common/ycdict.htm
O9 - Extra button: Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\Program Files\Yahoo!\Messenger\yhexbmes0521.dll
O9 - Extra 'Tools' menuitem: Yahoo! Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\Program Files\Yahoo!\Messenger\yhexbmes0521.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: @btrez.dll,-4015 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Program Files\Belkin\Bluetooth Software\btsendto_ie.htm
O9 - Extra 'Tools' menuitem: @btrez.dll,-4017 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Program Files\Belkin\Bluetooth Software\btsendto_ie.htm
O12 - Plugin for .spop: C:\Program Files\Internet Explorer\Plugins\NPDocBox.dll
O16 - DPF: Yahoo! Poker - http://download.games.yahoo.com/games/clients/y/pt1_x.cab
O16 - DPF: {2B323CD9-50E3-11D3-9466-00A0C9700498} (Yahoo! Audio Conferencing) - http://us.chat1.yimg.com/us.yimg.com/i/chat/applet/v45/yacscom.cab
O16 - DPF: {74EC0CB3-E304-11D4-AD00-00508BF6CCD1} (IMContainerG Control) - https://i10.uktransco.com/gals/galsmaps.cab
O16 - DPF: {7D1E9C49-BD6A-11D3-87A8-009027A35D73} (Yahoo! Audio UI1) - http://chat.yahoo.com/cab/yacsui.cab
O16 - DPF: {8E0D4DE5-3180-4024-A327-4DFAD1796A8D} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsClient.cab
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://www.pandasoftware.com/activescan/as5/asinst.cab
O16 - DPF: {C2FCEF52-ACE9-11D3-BEBD-00105AA9B6AE} (Symantec RuFSI Registry Information Class) - http://security.symantec.com/sscv6/SharedContent/common/bin/cabsa.cab
O16 - DPF: {DF780F87-FF2B-4DF8-92D0-73DB16A1543A} (PopCapLoader Object) - http://utu.popcap.com/games/popcaploader_v6.cab
O16 - DPF: {EC5A4E7B-02EB-451D-B310-D5F2E0A4D8C3} (webhelper Class) - https://register.btopenworld.com/templates/btwebcontrol.cab
O16 - DPF: {F58E1CEF-A068-4C15-BA5E-587CAF3EE8C6} (MSN Chat Control 4.5) - http://fdl.msn.com/public/chat/msnchat45.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{E56F6F16-5CBD-4FC5-92FA-EC49131572EC}: NameServer = 195.92.195.95 195.92.195.94
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
O23 - Service: Bluetooth Service (btwdins) - WIDCOMM, Inc. - C:\Program Files\Belkin\Bluetooth Software\bin\btwdins.exe
O23 - Service: Logical Disk Manager Administrative Service (dmadmin) - VERITAS Software Corp. - C:\WINNT\System32\dmadmin.exe
O23 - Service: Macromedia Licensing Service - Unknown owner - C:\Program Files\Common Files\Macromedia Shared\Service\Macromedia Licensing.exe
O23 - Service: Office Source Engine (ose) - Unknown owner - C:\Program Files\Common Files\Microsoft Shared\Source Engine\OSE.EXE (file missing)
Both files showed up in HJT and I fixed them but they were back again after reboot.
Then I follwed Chris's instructions, ran the killnail.bat file and got the following text:
C:\Documents and Settings\anna\Desktop>cd\
C:\>CD WINNT
C:\WINNT>dir C:\WINNT\Nail.exe
Volume in drive C has no label.
Volume Serial Number is B4B1-BE7C
Directory of C:\WINNT
15/04/2005 16:48 71,168 Nail.exe
1 File(s) 71,168 bytes
0 Dir(s) 1,513,877,504 bytes free
C:\WINNT>del C:\WINNT\Nail.exe
C:\WINNT>CD winnt\system32
The system cannot find the path specified.
C:\WINNT>dir c:\WINNT\system32\vxztlx.exe
Volume in drive C has no label.
Volume Serial Number is B4B1-BE7C
Directory of c:\WINNT\system32
04/12/2003 16:24 76,288 vxztlx.exe
1 File(s) 76,288 bytes
0 Dir(s) 1,513,951,232 bytes free
C:\WINNT>del c:\winnt\system32\vxztlx.exe
c:\winnt\system32\vxztlx.exe
The process cannot access the file because it is being used by another process.
C:\WINNT>pause
Press any key to continue . . .
HJT log:
Logfile of HijackThis v1.99.1
Scan saved at 17:03:09, on 15/04/2005
Platform: Windows 2000 SP4 (WinNT 5.00.2195)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)
Running processes:
C:\WINNT\System32\smss.exe
C:\WINNT\SYSTEM32\winlogon.exe
C:\WINNT\system32\services.exe
C:\WINNT\system32\lsass.exe
C:\WINNT\system32\svchost.exe
C:\WINNT\system32\spoolsv.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgamsvr.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
C:\Program Files\Belkin\Bluetooth Software\bin\btwdins.exe
C:\WINNT\System32\svchost.exe
C:\WINNT\system32\regsvc.exe
C:\WINNT\system32\MSTask.exe
C:\WINNT\System32\WBEM\WinMgmt.exe
C:\WINNT\system32\svchost.exe
C:\WINNT\Explorer.exe
C:\Program Files\Logitech\iTouch\iTouch.exe
C:\WINNT\system32\spool\drivers\w32x86\3\hpztsb07.exe
C:\PROGRA~1\COMMON~1\PCSuite\DATALA~1\DATALA~1.EXE
c:\winnt\system32\epovre.exe
C:\PROGRA~1\Nokia\NOKIAP~1\TRAYAP~1.EXE
C:\Program Files\Java\jre1.5.0_01\bin\jusched.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgemc.exe
F:\Programs\BullGuard 5.0\bullguard.exe
C:\Program Files\Belkin\Bluetooth Software\BTTray.exe
c:\PROGRA~1\COMMON~1\PCSuite\Services\SERVIC~1.EXE
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\PROGRA~1\Belkin\BLUETO~1\BTSTAC~1.EXE
F:\Programs\HJT\HijackThis.exe
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.yahoo.co.uk/
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.yahoo.co.uk/
F2 - REG:system.ini: Shell=Explorer.exe C:\WINNT\Nail.exe
O2 - BHO: Yahoo! Companion BHO - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\Program Files\Yahoo!\Companion\Installs\cpn\ycomp5_5_7_0.dll
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINNT\System32\msdxm.ocx
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn\ycomp5_5_7_0.dll
O4 - HKLM\..\Run: [zBrowser Launcher] C:\Program Files\Logitech\iTouch\iTouch.exe
O4 - HKLM\..\Run: [HPDJ Taskbar Utility] C:\WINNT\system32\spool\drivers\w32x86\3\hpztsb07.exe
O4 - HKLM\..\Run: [NeroCheck] C:\WINNT\system32\\NeroCheck.exe
O4 - HKLM\..\Run: [DataLayer] c:\PROGRA~1\COMMON~1\PCSuite\DATALA~1\DATALA~1.EXE
O4 - HKLM\..\Run: [PCSuiteTrayApplication] c:\PROGRA~1\Nokia\NOKIAP~1\TRAYAP~1.EXE
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\jre1.5.0_01\bin\jusched.exe
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\Grisoft\AVGFRE~1\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [AVG7_EMC] C:\PROGRA~1\Grisoft\AVGFRE~1\avgemc.exe
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [Synchronization Manager] mobsync.exe /logon
O4 - HKLM\..\Run: [gcasServ] "f:\Programs\Microsoft AntiSpyware\gcasServ.exe"
O4 - HKLM\..\Run: [fyvamr] c:\winnt\system32\epovre.exe
O4 - HKCU\..\Run: [Yahoo! Pager] C:\PROGRA~1\Yahoo!\MESSEN~1\ypager.exe -quiet
O4 - HKCU\..\Run: [BullGuard 5.0] "F:\Programs\BullGuard 5.0\bullguard.exe"
O4 - HKCU\..\Run: [LDM] \Program\BackWeb-8876480.exe
O4 - Global Startup: BTTray.lnk = C:\Program Files\Belkin\Bluetooth Software\BTTray.exe
O4 - Global Startup: Logitech Desktop Messenger.lnk = C:\Program Files\Logitech\Desktop Messenger\8876480\Program\LDMConf.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office\OSA9.EXE
O6 - HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel present
O8 - Extra context menu item: &Yahoo! Search - file:///C:\Program Files\Yahoo!\Common/ycsrch.htm
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O8 - Extra context menu item: Send To &Bluetooth - C:\Program Files\Belkin\Bluetooth Software\btsendto_ie_ctx.htm
O8 - Extra context menu item: Yahoo! &Dictionary - file:///C:\Program Files\Yahoo!\Common/ycdict.htm
O8 - Extra context menu item: Yahoo! &Maps - file:///C:\Program Files\Yahoo!\Common/ycdict.htm
O9 - Extra button: Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\Program Files\Yahoo!\Messenger\yhexbmes0521.dll
O9 - Extra 'Tools' menuitem: Yahoo! Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\Program Files\Yahoo!\Messenger\yhexbmes0521.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: @btrez.dll,-4015 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Program Files\Belkin\Bluetooth Software\btsendto_ie.htm
O9 - Extra 'Tools' menuitem: @btrez.dll,-4017 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Program Files\Belkin\Bluetooth Software\btsendto_ie.htm
O12 - Plugin for .spop: C:\Program Files\Internet Explorer\Plugins\NPDocBox.dll
O16 - DPF: Yahoo! Poker - http://download.games.yahoo.com/games/clients/y/pt1_x.cab
O16 - DPF: {2B323CD9-50E3-11D3-9466-00A0C9700498} (Yahoo! Audio Conferencing) - http://us.chat1.yimg.com/us.yimg.com/i/chat/applet/v45/yacscom.cab
O16 - DPF: {74EC0CB3-E304-11D4-AD00-00508BF6CCD1} (IMContainerG Control) - https://i10.uktransco.com/gals/galsmaps.cab
O16 - DPF: {7D1E9C49-BD6A-11D3-87A8-009027A35D73} (Yahoo! Audio UI1) - http://chat.yahoo.com/cab/yacsui.cab
O16 - DPF: {8E0D4DE5-3180-4024-A327-4DFAD1796A8D} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsClient.cab
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://www.pandasoftware.com/activescan/as5/asinst.cab
O16 - DPF: {C2FCEF52-ACE9-11D3-BEBD-00105AA9B6AE} (Symantec RuFSI Registry Information Class) - http://security.symantec.com/sscv6/SharedContent/common/bin/cabsa.cab
O16 - DPF: {DF780F87-FF2B-4DF8-92D0-73DB16A1543A} (PopCapLoader Object) - http://utu.popcap.com/games/popcaploader_v6.cab
O16 - DPF: {EC5A4E7B-02EB-451D-B310-D5F2E0A4D8C3} (webhelper Class) - https://register.btopenworld.com/templates/btwebcontrol.cab
O16 - DPF: {F58E1CEF-A068-4C15-BA5E-587CAF3EE8C6} (MSN Chat Control 4.5) - http://fdl.msn.com/public/chat/msnchat45.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{E56F6F16-5CBD-4FC5-92FA-EC49131572EC}: NameServer = 195.92.195.95 195.92.195.94
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
O23 - Service: Bluetooth Service (btwdins) - WIDCOMM, Inc. - C:\Program Files\Belkin\Bluetooth Software\bin\btwdins.exe
O23 - Service: Logical Disk Manager Administrative Service (dmadmin) - VERITAS Software Corp. - C:\WINNT\System32\dmadmin.exe
O23 - Service: Macromedia Licensing Service - Unknown owner - C:\Program Files\Common Files\Macromedia Shared\Service\Macromedia Licensing.exe
O23 - Service: Office Source Engine (ose) - Unknown owner - C:\Program Files\Common Files\Microsoft Shared\Source Engine\OSE.EXE (file missing)