Just to make sure before I delete these;
Logfile of HijackThis v1.99.1
Scan saved at 21:00:00, on 25/10/2005
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
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:\WINDOWS\Explorer.EXE
C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
C:\WINDOWS\SOUNDMAN.EXE
C:\WINDOWS\system32\RUNDLL32.EXE
D:\Microsoft AntiSpyware\gcasServ.exe
C:\Program Files\Common Files\Symantec Shared\ccApp.exe
D:\Xfire\Xfire.exe
D:\Microsoft AntiSpyware\gcasDtServ.exe
D:\Norton AntiVirus\navapsvc.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\Program Files\Common Files\Symantec Shared\Security Center\SymWSC.exe
C:\WINDOWS\system32\dllhost.exe
C:\WINDOWS\system32\svchost.exe
D:\HijackThis\HijackThis.exe
C:\WINDOWS\system32\NOTEPAD.EXE
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Messenger\msmsgs.exe
O4 - HKLM\..\Run: [SiSUSBRG] C:\WINDOWS\SiSUSBrg.exe
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
All of them look suspicious to me ( except the processes )