My system is XP Pro SP3 and I use IE7 for browsing. I use a non-admin account for routine day-to-day computer needs

I've had difficulty accessing and it's forum. When I try to access it now, I'm presented with a picture of a woman and adverts for several tools (a registry cleaner, network management tool etc.) I suspected that I had some malware so I started to investigate.

I have ClamWin which doesn't report any problems and I've run AdAware, Spybot (in Safe Mode) and HiJackThis (in Normal Mode). AdAware found some tracking cookies but nothing of any great concern and I allowed it to remove them. Spybot was clean. Here's the HiJackThis log:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 13:24:34, on 12/01/2009
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16762)
Boot mode: Normal

Running processes:
C:\Program Files\Intel\Wireless\Bin\EvtEng.exe
C:\Program Files\Intel\Wireless\Bin\S24EvMon.exe
C:\Program Files\Lavasoft\Ad-Aware\aawservice.exe
C:\Program Files\Intel\Wireless\Bin\RegSrvc.exe
C:\Program Files\VMware\VMware Server\tomcat\bin\Tomcat6.exe
C:\Program Files\VMware\VMware Server\vmware-authd.exe
C:\Program Files\VMware\VMware Server\vmware-hostd.exe
C:\Documents and Settings\Ignatius\Desktop\HiJackThis.exe

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL =
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL =
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page =
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext =
O2 - BHO: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\Program Files\Spybot - Search & Destroy\SDHelper.dll
O4 - HKLM\..\Run: [ATIModeChange] Ati2mdxx.exe
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [ClamWin] "C:\Program Files\ClamWin\bin\ClamTray.exe" --logon
O4 - HKLM\..\Run: [ZoneAlarm Client] "C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [SpybotSD TeaTimer] C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'LOCAL SERVICE')
O4 - HKUS\S-1-5-21-1292428093-839522115-1060284298-1004\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe (User 'Ignatius')
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')
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\Program Files\Spybot - Search & Destroy\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search && Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\Program Files\Spybot - Search & Destroy\SDHelper.dll
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.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
O10 - Unknown file in Winsock LSP: c:\program files\vmware\vmware server\vsocklib.dll
O10 - Unknown file in Winsock LSP: c:\program files\vmware\vmware server\vsocklib.dll
O15 - Trusted Zone:
O15 - Trusted Zone: http://*
O15 - Trusted Zone:
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) -
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) -
O16 - DPF: {B94C2238-346E-4C5E-9B36-8CC627F35574} (VMware Remote Console Plug-in - 
O23 - Service: Lavasoft Ad-Aware Service (aawservice) - Lavasoft - C:\Program Files\Lavasoft\Ad-Aware\aawservice.exe
O23 - Service: Ati HotKey Poller - Unknown owner - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: Intel(R) PROSet/Wireless Event Log (EvtEng) - Intel Corporation - C:\Program Files\Intel\Wireless\Bin\EvtEng.exe
O23 - Service: Imapi Helper - Alex Feinman - C:\Program Files\Alex Feinman\ISO Recorder\ImapiHelper.exe
O23 - Service: Intel(R) PROSet/Wireless Registry Service (RegSrvc) - Intel Corporation - C:\Program Files\Intel\Wireless\Bin\RegSrvc.exe
O23 - Service: Intel(R) PROSet/Wireless Service (S24EventMonitor) - Intel Corporation  - C:\Program Files\Intel\Wireless\Bin\S24EvMon.exe
O23 - Service: VMware Authorization Service (VMAuthdService) - VMware, Inc. - C:\Program Files\VMware\VMware Server\vmware-authd.exe
O23 - Service: VMware DHCP Service (VMnetDHCP) - VMware, Inc. - C:\WINDOWS\system32\vmnetdhcp.exe
O23 - Service: VMware NAT Service - VMware, Inc. - C:\WINDOWS\system32\vmnat.exe
O23 - Service: VMware Host Agent (VMwareHostd) - Unknown owner - C:\Program Files\VMware\VMware Server\vmware-hostd.exe
O23 - Service: VMware Server Web Access (VMwareServerWebAccess) - Apache Software Foundation - C:\Program Files\VMware\VMware Server\tomcat\bin\Tomcat6.exe
O23 - Service: VMware VSS Writer (vmwriter) - VMware, Inc. - C:\Program Files\VMware\VMware Server\vmVssWriter.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs, LLC - C:\WINDOWS\system32\ZoneLabs\vsmon.exe

End of file - 6123 bytes
I've rebooted several times between the various scans and also rebooted my ADSL router but the problem persists.

Does anyone have any recommendations?

Thanks for your time.