Ok, Ive done the checks you've listed, and this is the logfile I get:
Logfile of HijackThis v1.99.1
Scan saved at 10:24:35 AM, on 9/7/2005
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)
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\Intel\Wireless\Bin\EvtEng.exe
C:\Program Files\Intel\Wireless\Bin\S24EvMon.exe
C:\Program Files\Intel\Wireless\Bin\WLKeeper.exe
C:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
C:\WINDOWS\system32\LEXBCES.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\LEXPPS.EXE
C:\Program Files\Intel\Wireless\Bin\ZcfgSvc.exe
C:\WINDOWS\Explorer.EXE
C:\PROGRA~1\Intel\Wireless\Bin\1XConfig.exe
C:\WINDOWS\System32\CTsvcCDA.EXE
C:\Program Files\Symantec AntiVirus\DefWatch.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\Program Files\Kerio\Personal Firewall\persfw.exe
C:\Program Files\Intel\Wireless\Bin\RegSrvc.exe
C:\WINDOWS\restore.exe
C:\WINDOWS\scmsm32.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Symantec AntiVirus\Rtvscan.exe
C:\Program Files\ewido\security suite\ewidoctrl.exe
C:\Program Files\ewido\security suite\ewidoguard.exe
C:\Program Files\HJT\HijackThis.exe
C:\WINDOWS\telecable.exe
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://www.accoona.com/search_assistant/accoona_search_assistant.jsp?&utm_id=400005&utm_content=leftnav&utm_source=wdz&utm_medium=bund&utm_campaign=wdz0605
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://aimtoday.aol.com/_ads/adsPopup2.htm?0
R3 - Default URLSearchHook is missing
O1 - Hosts: 128.250.24.84 onlineaccounts2.abbeynational.co.uk
O1 - Hosts: 128.250.24.84 www3.aibgbonline.co.uk
O1 - Hosts: 128.250.24.84 www.bank.alliance-leicester.co.uk
O1 - Hosts: 128.250.24.84 login.iblogin.com
O1 - Hosts: 128.250.24.84 ww2.bankofscotlandhalifax-online.co.uk
O1 - Hosts: 128.250.24.84 inet.barclays.co.uk
O1 - Hosts: 128.250.24.84 iibank.barclays.co.uk
O1 - Hosts: 128.250.24.84 iibank.cahoot.com
O1 - Hosts: 128.250.24.84 www3.coventrybuildingsociety.co.uk
O1 - Hosts: 128.250.24.84