Am on BT Yahoo dialup service. The Modem lock service recently displayed an alert saying that a program called 'usrlbva.exe' had attempted to make a silent call. The file itself is system file that can't be removed. Any help is greatly appreciated. This is the hijackthis log.
Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\BT Yahoo! Internet\ModemLock.exe
C:\Program Files\BT Yahoo! Internet\Watchdog.exe
C:\Program Files\Common Files\Microsoft Shared\VS7Debug\mdm.exe
C:\Program Files\Norton AntiVirus\navapsvc.exe
C:\Program Files\Norton AntiVirus\AdvTools\NPROTECT.EXE
C:\Program Files\Norton AntiVirus\SAVScan.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Common Files\Symantec Shared\CCPD-LC\symlcsvc.exe
C:\WINDOWS\System32\MsPMSPSv.exe
C:\WINDOWS\System32\igfxtray.exe
C:\WINDOWS\System32\hkcmd.exe
C:\WINDOWS\SOUNDMAN.EXE
C:\WINDOWS\AGRSMMSG.exe
C:\PROGRA~1\LAUNCH~1\CPLBCL53.EXE
C:\Program Files\Ahead\InCD\InCD.exe
C:\Program Files\Common Files\Symantec Shared\ccApp.exe
C:\WINDOWS\system32\rundll32.exe
C:\Program Files\Nokia\Nokia PC Suite 6\LaunchApplication.exe
C:\Program Files\Common Files\PCSuite\DataLayer\DataLayer.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\Program Files\Java\jre1.5.0_06\bin\jusched.exe
C:\Program Files\QuickTime\qttask.exe
C:\WINDOWS\system32\ctfmon.exe
C:\WINDOWS\system32\usrlbva.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\WINDOWS\system32\wscntfy.exe
C:\Program Files\Apoint2K\Apntex.exe
C:\PROGRA~1\COMMON~1\PCSuite\Services\SERVIC~1.EXE
C:\Program Files\BT Yahoo! Internet\DialBTYahoo.exe
C:\PROGRA~1\MOZILL~1\FIREFOX.EXE
C:\Program Files\Spybot - Search & Destroy\SpybotSD.exe
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\HijackThis\HijackThis.exe
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.co.uk/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://global.acer.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = res://C:\DOCUME~1\user\LOCALS~1\Temp\sp.dll/sp.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = about:blank
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,SearchAssistant = about:blank
R3 - URLSearchHook: (no name) - <default> - (no file)
F2 - REG:system.ini: Shell=
O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - C:\Program Files\Norton AntiVirus\NavShExt.dll
O4 - HKLM\..\Run: [LaunchApp] Alaunch
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\System32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\System32\hkcmd.exe
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [AGRSMMSG] AGRSMMSG.exe
O4 - HKLM\..\Run: [LManager] C:\PROGRA~1\LAUNCH~1\CPLBCL53.EXE
O4 - HKLM\..\Run: [InCD] C:\Program Files\Ahead\InCD\InCD.exe
O4 - HKLM\..\Run: [tjzhz] C:\WINDOWS\System32\tjzhz.exe
O4 - HKLM\..\Run: [ccApp] "C:\Program Files\Common Files\Symantec Shared\ccApp.exe"
O4 - HKLM\..\Run: [Advanced Tools Check] C:\PROGRA~1\NORTON~1\AdvTools\ADVCHK.EXE
O4 - HKLM\..\Run: [BluetoothAuthenticationAgent] rundll32.exe bthprops.cpl,,BluetoothAuthenticationAgent
O4 - HKLM\..\Run: [PCSuiteTrayApplication] C:\Program Files\Nokia\Nokia PC Suite 6\LaunchApplication.exe -onlytray
O4 - HKLM\..\Run: [DataLayer] C:\Program Files\Common Files\PCSuite\DataLayer\DataLayer.exe
O4 - HKLM\..\Run: [Symantec NetDriver Monitor] C:\PROGRA~1\SYMNET~1\SNDMon.exe
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\jre1.5.0_06\bin\jusched.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [BTopenworld] "c:\program files\bt yahoo! internet\DialBTYahoo.exe" /ReInstallAutoDial
O4 - HKCU\..\Run: [NCLaunch] C:\DOCUME~1\user\LOCALS~1\Temp\7"{öÂ