Thank you for your help Broni.

I printed out your instructions and followed them implicitly.

When I ran SUPERAntiSpyware, it said that the system was OK. I went to check the log afterwards (so I knew what I was looking at to post it here) and there isn't a log at all!

I ran the Malaware bytes program and again there is no log! (I looked in all the places you listed too, there isn't even a folder called 'log' in the Malaware folder!)

I ran the GMER program. Here is the log:

GMER 1.0.15.14972 - GMER - Rootkit Detector and Remover
Rootkit scan 2009-05-18 13:42:53
Windows 5.1.2600 Service Pack 2


---- Devices - GMER 1.0.15 ----

AttachedDevice \FileSystem\Ntfs \Ntfs savonaccessfilter.sys (SAV On-access and HIPS for Windows XP (x86)/Sophos Plc)
AttachedDevice \FileSystem\Fastfat \Fat savonaccessfilter.sys (SAV On-access and HIPS for Windows XP (x86)/Sophos Plc)

---- EOF - GMER 1.0.15 ----


I ran another HijackThis. Here is the log:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 13:47:15, on 18/05/2009
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
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\Explorer.EXE
C:\WINDOWS\system32\LEXBCES.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\LEXPPS.EXE
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\SUPERAntiSpyware\SUPERAntiSpyware.exe
C:\Program Files\Sophos\AutoUpdate\ALMon.exe
C:\Program Files\Sophos\Sophos Anti-Virus\SAVAdminService.exe
c:\Program Files\Sophos\AutoUpdate\ALsvc.exe
C:\WINDOWS\system32\wscntfy.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = about:blank
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [SUPERAntiSpyware] C:\Program Files\SUPERAntiSpyware\SUPERAntiSpyware.exe
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'LOCAL SERVICE')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'NETWORK SERVICE')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - Global Startup: AutoUpdate Monitor.lnk = C:\Program Files\Sophos\AutoUpdate\ALMon.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office\OSA9.EXE
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
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/windowsu...?1242573309765
O20 - Winlogon Notify: !SASWinLogon - C:\Program Files\SUPERAntiSpyware\SASWINLO.dll
O23 - Service: LexBce Server (LexBceS) - Lexmark International, Inc. - C:\WINDOWS\system32\LEXBCES.EXE
O23 - Service: Sophos Anti-Virus status reporter (SAVAdminService) - Sophos Plc - C:\Program Files\Sophos\Sophos Anti-Virus\SAVAdminService.exe
O23 - Service: Sophos Anti-Virus (SAVService) - Sophos Plc - C:\Program Files\Sophos\Sophos Anti-Virus\SavService.exe
O23 - Service: Sophos AutoUpdate Service - Sophos Plc - c:\Program Files\Sophos\AutoUpdate\ALsvc.exe

--
End of file - 2784 bytes

Thank you again. I'll look out for further instructions.