isass.exe fjerne hvordan

jeg har en PC hvor der er isass.exe der lukker pc-en og jeg har et norton antivirus med en betalt opdatering, men kan ikke få adgang til denne opdatering, er det pgs isass.exe.

Hvordan fjerne jeg isass.exe

jeg har en log fra hijack programmet, fortæller den noget?
på forhånd tak

Logfile of HijackThis v1.99.1
Scan saved at 17:47:51, on 23-09-2005
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

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\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
c:\Programmer\Fælles filer\Symantec Shared\ccEvtMgr.exe
C:\windows\system\hpsysdrv.exe
C:\HP\KBD\KBD.EXE
C:\Programmer\Fælles filer\Microsoft Shared\VS7Debug\mdm.exe
C:\Programmer\Fælles filer\Symantec Shared\ccApp.exe
C:\Programmer\Messenger\msmsgs.exe
c:\Programmer\Norton AntiVirus\navapsvc.exe
C:\Documents and Settings\Ejer\Skrivebord\hijackthis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://signon.stofanet.dk/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Hyperlinks
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmer\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: NAV Helper - {BDF3E430-B101-42AD-A544-FADC6B084872} - c:\Programmer\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - c:\Programmer\Norton AntiVirus\NavShExt.dll
O4 - HKLM\..\Run: [hpsysdrv] c:\windows\system\hpsysdrv.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\System32\hkcmd.exe
O4 - HKLM\..\Run: [KBD] C:\HP\KBD\KBD.EXE
O4 - HKLM\..\Run: [StorageGuard] "C:\Programmer\Fælles filer\Sonic\Update Manager\sgtray.exe" /r
O4 - HKLM\..\Run: [Recguard] C:\WINDOWS\SMINST\RECGUARD.EXE
O4 - HKLM\..\Run: [ccApp] "c:\Programmer\Fælles filer\Symantec Shared\ccApp.exe"
O4 - HKLM\..\Run: [ccRegVfy] "c:\Programmer\Fælles filer\Symantec Shared\ccRegVfy.exe"
O4 - HKLM\..\Run: [AlcxMonitor] ALCXMNTR.EXE
O4 - HKLM\..\Run: [PS2] C:\WINDOWS\system32\ps2.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmer\Messenger\msmsgs.exe" /background
O9 - Extra button: Related - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
O9 - Extra 'Tools' menuitem: Show &Related Links - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
O20 - Winlogon Notify: igfxcui - C:\WINDOWS\SYSTEM32\igfxsrvc.dll
O23 - Service: Symantec Event Manager (ccEvtMgr) - Symantec Corporation - c:\Programmer\Fælles filer\Symantec Shared\ccEvtMgr.exe
O23 - Service: Symantec Password Validation Service (ccPwdSvc) - Symantec Corporation - c:\Programmer\Fælles filer\Symantec Shared\ccPwdSvc.exe
O23 - Service: Norton AntiVirus Auto Protect (navapsvc) - Symantec Corporation - c:\Programmer\Norton AntiVirus\navapsvc.exe
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: Symantec Network Drivers Service (SNDSrvc) - Symantec Corporation - C:\Programmer\Fælles filer\Symantec Shared\SNDSrvc.exe