StealthMBR trojan help

I have a Sony Vaio running windows xp. i have cox internet service using a mcaffee security suite. starting a few days back when ever i start up the computer mcaffee claims i have a trojan "StealthMBR!mbr" but it says it cannot be quarintined and when i do a scan nothing is found. i tried using malwarebytes but it did not help. here is my hjthis log:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 3:05:38 AM, on 3/8/2009
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP3 (6.00.2900.5512)
Boot mode: Normal

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:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Common Files\Authentium\AntiVirus\dvpapi.exe
C:\WINDOWS\system32\gearsec.exe
C:\Program Files\McAfee\SiteAdvisor\McSACore.exe
C:\PROGRA~1\McAfee\MSC\mcmscsvc.exe
c:\PROGRA~1\COMMON~1\mcafee\mna\mcnasvc.exe
c:\PROGRA~1\COMMON~1\mcafee\mcproxy\mcproxy.exe
C:\PROGRA~1\McAfee\VIRUSS~1\mcshield.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Viewpoint\Common\ViewpointService.exe
C:\WINDOWS\Explorer.EXE
c:\PROGRA~1\mcafee.com\agent\mcagent.exe
C:\WINDOWS\System32\hkcmd.exe
C:\WINDOWS\System32\ezSP_Px.exe
C:\WINDOWS\AGRSMMSG.exe
C:\Program Files\QuickTime\QTTask.exe
C:\Program Files\Linksys EasyLink Advisor\LinksysAgent.exe
C:\Program Files\Viewpoint\Viewpoint Manager\ViewMgr.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Program Files\McAfee\MPF\MPFSrv.exe
C:\PROGRA~1\McAfee\VIRUSS~1\mcsysmon.exe
C:\Program Files\McAfee\MSC\mcshell.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\WINDOWS\system32\rundll32.exe
c:\PROGRA~1\mcafee\VIRUSS~1\mcvsshld.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.cox.net/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.sony.com/vaiopeople
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://red.clientapps.yahoo.com/customize/ie/defaults/sb/ymsgr6/*http://www.yahoo.com/ext/search/search.html
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = localhost
O2 - BHO: scriptproxy - {7DB2D5A0-7241-4E79-B68D-6309F01C5231} - C:\Program Files\McAfee\VirusScan\scriptsn.dll
O2 - BHO: McAfee SiteAdvisor BHO - {B164E929-A1B6-4A06-B104-2CD0E90A88FF} - c:\PROGRA~1\mcafee\SITEAD~1\mcieplg.dll
O2 - BHO: (no name) - {C38EDFCC-97A6-48C4-B0B1-3E06F73CAA7C} - (no file)
O3 - Toolbar: McAfee SiteAdvisor Toolbar - {0EBBBE48-BAD4-4B4C-8E5A-516ABECAE064} - c:\PROGRA~1\mcafee\SITEAD~1\mcieplg.dll
O4 - HKLM\..\Run: [ATIModeChange] Ati2mdxx.exe
O4 - HKLM\..\Run: [ATIPTA] "C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe"
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\System32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\System32\hkcmd.exe
O4 - HKLM\..\Run: [ezShieldProtector for Px] C:\WINDOWS\System32\ezSP_Px.exe
O4 - HKLM\..\Run: [AGRSMMSG] AGRSMMSG.exe
O4 - HKLM\..\Run: [StorageGuard] "C:\Program Files\VERITAS Software\Update Manager\sgtray.exe" /r
O4 - HKLM\..\Run: [VAIO Recovery] "C:\WINDOWS\Sonysys\VAIO Recovery\PartSeal.exe"
O4 - HKLM\..\Run: [UserFaultCheck] %systemroot%\system32\dumprep 0 -u
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\QTTask.exe" -atboottime
O4 - HKLM\..\Run: [nwiz] "nwiz.exe" /installquiet
O4 - HKLM\..\Run: [mcagent_exe] C:\Program Files\McAfee.com\Agent\mcagent.exe /runkey
O4 - HKCU\..\Run: [EasyLinkAdvisor] "C:\Program Files\Linksys EasyLink Advisor\LinksysAgent.exe" /startup
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MI1933~1\Office10\EXCEL.EXE/3000
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O14 - IERESET.INF: START_PAGE_URL=http://www.sony.com/vaiopeople
O15 - Trusted Zone: http://*.mcafee.com
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O18 - Protocol: sacore - {5513F07E-936B-4E52-9B00-067394E91CC5} - c:\PROGRA~1\mcafee\SITEAD~1\mcieplg.dll
O23 - Service: DvpApi (dvpapi) - Authentium, Inc. - C:\Program Files\Common Files\Authentium\AntiVirus\dvpapi.exe
O23 - Service: Error Reporting Service ERSvcRpcLocator (ERSvcRpcLocator) - Unknown owner - C:\WINDOWS\
O23 - Service: GEARSecurity - GEAR Software - C:\WINDOWS\system32\gearsec.exe
O23 - Service: Human Interface Device Access HidServMcNASvc (HidServMcNASvc) - Unknown owner - C:\WINDOWS\
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: McAfee SiteAdvisor Service - Unknown owner - C:\Program Files\McAfee\SiteAdvisor\McSACore.exe
O23 - Service: McAfee Services (mcmscsvc) - McAfee, Inc. - C:\PROGRA~1\McAfee\MSC\mcmscsvc.exe
O23 - Service: McAfee Services mcmscsvcAOLService (mcmscsvcAOLService) - Unknown owner - C:\WINDOWS\
O23 - Service: McAfee Network Agent (McNASvc) - McAfee, Inc. - c:\PROGRA~1\COMMON~1\mcafee\mna\mcnasvc.exe
O23 - Service: McAfee Network Agent McNASvcRasMan (McNASvcRasMan) - Unknown owner - C:\WINDOWS\
O23 - Service: McAfee Scanner (McODS) - McAfee, Inc. - C:\PROGRA~1\McAfee\VIRUSS~1\mcods.exe
O23 - Service: McAfee Proxy Service (McProxy) - McAfee, Inc. - c:\PROGRA~1\COMMON~1\mcafee\mcproxy\mcproxy.exe
O23 - Service: McAfee Real-time Scanner (McShield) - McAfee, Inc. - C:\PROGRA~1\McAfee\VIRUSS~1\mcshield.exe
O23 - Service: McAfee Real-time Scanner McShieldmcmscsvc (McShieldmcmscsvc) - Unknown owner - C:\WINDOWS\
O23 - Service: McAfee SystemGuards (McSysmon) - McAfee, Inc. - C:\PROGRA~1\McAfee\VIRUSS~1\mcsysmon.exe
O23 - Service: McAfee Personal Firewall Service (MpfService) - McAfee, Inc. - C:\Program Files\McAfee\MPF\MPFSrv.exe
O23 - Service: Sony SPTI Service (SPTISRV) - Sony Corporation - C:\PROGRA~1\COMMON~1\SONYSH~1\AVLib\Sptisrv.exe
O23 - Service: Viewpoint Manager Service - Viewpoint Corporation - C:\Program Files\Viewpoint\Common\ViewpointService.exe
O23 - Service: Portable Media Serial Number Service WmdmPmSNWmiApSrv (WmdmPmSNWmiApSrv) - Unknown owner - C:\WINDOWS\

--
End of file - 6285 bytes

We are sorry you have waited so long for a response. As you can see, we are quite busy as are all the other help forums. Also, it is possible that you received no response because there was no malware evident in your HijackThis log.

If you still require help, please start a new topic and post a fresh HijackThis log, along with a complete description of all symptoms you are currently experiencing that make you feel your system is infected with malware. Also, in the same post, please include an Uninstall List.

To create an Uninstall List, open HijackThis and, from the Main Menu > click on the "Open the Misc Tools section" button > click "Open Uninstall Manager" > click "Save List." Save the list to your Desktop or any convenient location. Next, copy the contents of the Uninstall List and paste it into the same post as your HijackThis log.

This topic is now closed. Please start a new topic by following the HijackThis Guideline posted here, and be sure to include your Uninstall List: >Guideline for posting your HijackThis log<