I don't know how I have got it but I am really careful about what I put on my home PC.
Anyway - here is my Hijackthis log - I have read a number of forums and tried, Ad-Ware, Spypost, Pest Control and Hijack this but it keeps coming back. I post this log after a complete Ad-ware sweep and then launching IE6
Logfile of HijackThis v1.99.1
Scan saved at 15:09:17, on 21/03/05
Platform: Windows 98 Gold (Win9x 4.10.1998)
MSIE: Unable to get Internet Explorer version!
Running processes:
C:\WINDOWS\SYSTEM\KERNEL32.DLL
C:\WINDOWS\SYSTEM\MSGSRV32.EXE
C:\WINDOWS\SYSTEM\MPREXE.EXE
C:\WINDOWS\SYSTEM\ZONELABS\VSMON.EXE
C:\WINDOWS\SYSTEM\MSTASK.EXE
C:\WINDOWS\SYSTEM\mmtask.tsk
C:\WINDOWS\EXPLORER.EXE
C:\WINDOWS\TASKMON.EXE
C:\WINDOWS\SYSTEM\SYSTRAY.EXE
C:\WINDOWS\SYSTEM\PDESK.EXE
C:\WINDOWS\SYSTEM\STIMON.EXE
C:\WINDOWS\STARTER.EXE
C:\PROGRAM FILES\ZONE LABS\ZONEALARM\ZLCLIENT.EXE
C:\WINDOWS\SYSTEM\DDHELP.EXE
C:\WINDOWS\RUNDLL32.EXE
C:\PROGRAM FILES\MOZILLA FIREFOX\FIREFOX.EXE
C:\WINDOWS\DESKTOP\HIJACKTHIS.EXE
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = res://C:\WINDOWS\TEMP\se.dll/sp.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = about:blank
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = res://C:\WINDOWS\TEMP\se.dll/sp.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = about:blank
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = about:blank
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,SearchAssistant = about:blank
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = about:blank
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,HomeOldSP = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,HomeOldSP = about:blank
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\PROGRAM FILES\ADOBE\ACROBAT 5.0\READER\ACTIVEX\ACROIEHELPER.OCX
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Program Files\Spybot - Search & Destroy\SDHelper.dll
O2 - BHO: (no name) - {C04A91B9-99D0-11D9-8F3D-00504E229330} - C:\WINDOWS\SYSTEM\DDCOB.DLL
O4 - HKLM\..\Run: [ScanRegistry] C:\WINDOWS\scanregw.exe /autorun
O4 - HKLM\..\Run: [TaskMonitor] C:\WINDOWS\taskmon.exe
O4 - HKLM\..\Run: [SystemTray] SysTray.ExE
O4 - HKLM\..\Run: [Hercules Daemon] hdaemon.exe
O4 - HKLM\..\Run: [Matrox Powerdesk] C:\WINDOWS\SYSTEM\PDesk.exe /Autolaunch
O4 - HKLM\..\Run: [SoundFusion] RunDll32 cwcprops.cpl,CrystalControlWnd
O4 - HKLM\..\Run: [StillImageMonitor] C:\WINDOWS\SYSTEM\STIMON.EXE
O4 - HKLM\..\Run: [EnsoniqMixer] starter.exe
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [Zone Labs Client] "C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKLM\..\Run: [sp] rundll32 C:\WINDOWS\TEMP\SE.DLL,DllInstall
O4 - HKLM\..\RunServices: [TrueVector] C:\WINDOWS\SYSTEM\ZONELABS\VSMON.EXE -service
O4 - HKLM\..\RunServices: [MiniLog] C:\WINDOWS\SYSTEM\ZONELABS\MINILOG.EXE -service
O4 - HKLM\..\RunServices: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\RunServices: [SchedulingAgent] mstask.exe
O4 - Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office\OSA9.EXE
O12 - Plugin for .spop: C:\PROGRA~1\INTERN~1\Plugins\NPDocBox.dll
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn...pdownloader.cab
O16 - DPF: {EF791A6B-FC12-4C68-99EF-FB9E207A39E6} (McFreeScan Class) - http://download.mcaf...432/mcfscan.cab
O18 - Filter: text/html - {4EA677E0-9A1A-11D9-8F3E-00502EE24005} - C:\WINDOWS\SYSTEM\DDCOB.DLL
O18 - Filter: text/plain - {4EA677E0-9A1A-11D9-8F3E-00502EE24005} - C:\WINDOWS\SYSTEM\DDCOB.DLL
Everytime I delete the suspicious files they return after I open IE.
(On a side note is anyone trying to prosecute adware companies/authors because it is the single most irritating thing about the internet.)