Would someone more expert than myself look at the log below, please.

I ran Avast AV, Spybot S&D and AdAware on my fairly new system (refurbished and reformatted Dell Optiplex GX 240) and found a number of trojans which I either quarantined as recommended by AVast, or removed with S&D, but one of them was WIN32.VB.ahq which I understand is a notoriously difficult remove.

Would appreciate any comments or advice

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 11:15:55 AM, on 8/19/2007
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:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
C:\Program Files\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Lavasoft\Ad-Aware 2007\aawservice.exe
C:\Program Files\Alwil Software\Avast4\ashWebSv.exe
C:\WINDOWS\Explorer.EXE
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Program Files\Java\jre1.6.0_02\bin\jusched.exe
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\NoAds\NoAds.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Program Files\HiJackThis.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\WINDOWS\system32\Explorer.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.yahoo.com/
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_02\bin\ssv.dll
O4 - HKLM\..\Run: [NeroCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_02\bin\jusched.exe"
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files\Adobe\Reader 8.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [IESet] IExplorer.dll .dbt
O4 - HKLM\..\RunServices: [IESet] IExplorer.dll .dbt
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [NoAds] "C:\Program Files\NoAds\NoAds.exe"
O4 - HKCU\..\Run: [BitTorrent] "C:\Documents and Settings\T & C\My Documents\bittorrent.exe" --force_start_minimized
O4 - HKCU\..\Run: [IESet] IExplorer.dll .dbt
O4 - HKUS\S-1-5-18\..\Run: [IESet] IExplorer.dll .dbt (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [IESet] IExplorer.dll .dbt (User 'Default user')
O4 - Startup: TA_Start.lnk = C:\WINDOWS\system32\lldsrngq.exe
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\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_02\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_02\bin\ssv.dll
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
O15 - Trusted Zone: *.amaena.com
O15 - Trusted Zone: *.drivecleaner.com
O15 - Trusted Zone: *.errorprotector.com
O15 - Trusted Zone: *.errorsafe.com
O15 - Trusted Zone: *.systemdoctor.com
O15 - Trusted Zone: *.winantispyware.com
O15 - Trusted Zone: *.winantivirus.com
O15 - Trusted Zone: *.winfixer.com
O16 - DPF: {01A88BB1-1174-41EC-ACCB-963509EAE56B} (SysProWmi Class) - http://support.dell.com/systemprofiler/SysPro.CAB
O16 - DPF: {106E49CF-797A-11D2-81A2-00E02C015623} (AlternaTIFF ActiveX) - https://www.rcashasp.com/rcash/apps/realmtiff.cab
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O16 - DPF: {25365FF3-2746-4230-9DA7-163CCA318309} (Automatic Driver Installation Control) - http://inst.c-wss.com/n035p/EN/install/gtdownlr.cab
O16 - DPF: {3BA3B159-7533-4F96-A2CE-EE5894BBD3D5} (Scanner.SysScanner) - http://i.dell.com/images/global/js/scanner/SYSSCANNER.cab
O16 - DPF: {B8BE5E93-A60C-4D26-A2DC-220313175592} (MSN Games - Installer) - http://cdn2.zone.msn.com/binFramework/v10/...ro.cab56649.cab
O16 - DPF: {DF780F87-FF2B-4DF8-92D0-73DB16A1543A} (PopCapLoader Object) - http://zone.msn.com/bingame/popcaploader_v10.cab
O16 - DPF: {E5ABEB00-B357-4884-9949-77B2C71A7EE3} (BoardCtl Class) - http://www.intel.com/design/motherbd/boardid/BoardID.cab
O23 - Service: Ad-Aware 2007 Service (aawservice) - Lavasoft AB - C:\Program Files\Lavasoft\Ad-Aware 2007\aawservice.exe
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - ALWIL Software - C:\Program Files\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - ALWIL Software - C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
O23 - Service: avast! Web Scanner - ALWIL Software - C:\Program Files\Alwil Software\Avast4\ashWebSv.exe