Thanks so much to everyone for your help.
Logfile of HijackThis v1.99.1
Scan saved at 22:34:41, on 31/03/05
Platform: Windows 98 SE (Win9x 4.10.2222A)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)
Running processes:
C:\WINDOWS\SYSTEM\KERNEL32.DLL
C:\WINDOWS\SYSTEM\MSGSRV32.EXE
C:\WINDOWS\SYSTEM\MPREXE.EXE
C:\WINDOWS\SYSTEM\MSTASK.EXE
C:\WINDOWS\SYSTEM\mmtask.tsk
C:\PROGRAM FILES\NORTON SYSTEMWORKS\NORTON CLEANSWEEP\CSINJECT.EXE
C:\PROGRAM FILES\COMMON FILES\SYMANTEC SHARED\SYMTRAY.EXE
C:\WINDOWS\EXPLORER.EXE
C:\WINDOWS\TASKMON.EXE
C:\WINDOWS\SYSTEM\SYSTRAY.EXE
C:\WINDOWS\SYSTEM\IRMON.EXE
C:\PROGRAM FILES\NORTON SYSTEMWORKS\NORTON ANTIVIRUS\NAVAPW32.EXE
C:\PROGRAM FILES\NORTON SYSTEMWORKS\NORTON ANTIVIRUS\POPROXY.EXE
C:\PROGRAM FILES\BROWSER MOUSE\BROWSER MOUSE\1.1\MOUSE32A.EXE
C:\WINDOWS\LOADQM.EXE
C:\PROGRAM FILES\NORTON SYSTEMWORKS\NORTON CRASHGUARD\CGMENU.EXE
C:\WINDOWS\SYSTEM\STIMON.EXE
C:\PROGRAM FILES\GRISOFT\AVG FREE\AVGCC.EXE
C:\PROGRAM FILES\GRISOFT\AVG FREE\AVGEMC.EXE
C:\PROGRAM FILES\GRISOFT\AVG FREE\AVGAMSVR.EXE
C:\WINDOWS\RUNDLL32.EXE
C:\WINDOWS\SYSTEM\WMIEXE.EXE
C:\PROGRAM FILES\MOZILLA FIREFOX\FIREFOX.EXE
C:\WINDOWS\PROFILES\JON\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
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.wanadoo.co.uk/
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
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: (no name) - {75512D82-A209-11D9-B1FD-00101067B599} - C:\WINDOWS\SYSTEM\NODKCAA.DLL
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar1.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: [IrMon] IrMon.exe
O4 - HKLM\..\Run: [Norton Auto-Protect] C:\PROGRA~1\NORTON~1\NORTON~2\NAVAPW32.EXE /LOADQUIET
O4 - HKLM\..\Run: [Norton eMail Protect] C:\PROGRAM FILES\NORTON SYSTEMWORKS\NORTON ANTIVIRUS\POProxy.exe
O4 - HKLM\..\Run: [LWBMOUSE] C:\Program Files\Browser Mouse\Browser Mouse\1.1\MOUSE32A.EXE
O4 - HKLM\..\Run: [LoadQM] loadqm.exe
O4 - HKLM\..\Run: [Norton CrashGuard Monitor] "C:\PROGRAM FILES\NORTON SYSTEMWORKS\NORTON CRASHGUARD\CGMenu.EXE"
O4 - HKLM\..\Run: [StillImageMonitor] C:\WINDOWS\SYSTEM\STIMON.EXE
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\GRISOFT\AVGFRE~1\AVGCC.EXE /STARTUP
O4 - HKLM\..\Run: [AVG7_EMC] C:\PROGRA~1\GRISOFT\AVGFRE~1\AVGEMC.EXE
O4 - HKLM\..\Run: [AVG7_AMSVR] C:\PROGRA~1\GRISOFT\AVGFRE~1\AVGAMSVR.EXE
O4 - HKLM\..\Run: [sp] rundll32 C:\WINDOWS\TEMP\SE.DLL,DllInstall
O4 - HKLM\..\RunServices: [SchedulingAgent] mstask.exe
O4 - HKLM\..\RunServices: [CSINJECT.EXE] C:\Program Files\Norton SystemWorks\Norton CleanSweep\CSINJECT.EXE
O4 - HKLM\..\RunServices: [SymTray - Norton SystemWorks] C:\Program Files\Common Files\Symantec Shared\SymTray.exe "Norton SystemWorks"
O8 - Extra context menu item: &Google Search - res://C:\PROGRAM FILES\GOOGLE\GOOGLETOOLBAR1.DLL/cmsearch.html
O8 - Extra context menu item: Cached Snapshot of Page - res://C:\PROGRAM FILES\GOOGLE\GOOGLETOOLBAR1.DLL/cmcache.html
O8 - Extra context menu item: Similar Pages - res://C:\PROGRAM FILES\GOOGLE\GOOGLETOOLBAR1.DLL/cmsimilar.html
O8 - Extra context menu item: Backward Links - res://C:\PROGRAM FILES\GOOGLE\GOOGLETOOLBAR1.DLL/cmbacklinks.html
O8 - Extra context menu item: Translate into English - res://C:\PROGRAM FILES\GOOGLE\GOOGLETOOLBAR1.DLL/cmtrans.html
O9 - Extra button: Yahoo! Messenger - {E5D12C4E-7B4F-11D3-B5C9-0050045C3C96} - C:\PROGRAM FILES\YAHOO!\MESSENGER\YPAGER.EXE
O9 - Extra 'Tools' menuitem: Yahoo! Messenger - {E5D12C4E-7B4F-11D3-B5C9-0050045C3C96} - C:\PROGRAM FILES\YAHOO!\MESSENGER\YPAGER.EXE
O14 - IERESET.INF: START_PAGE_URL=http://www.wanadoo.co.uk/
O16 - DPF: {F04A8AE2-A59D-11D2-8792-00C04F8EF29D} (Hotmail Attachments Control) - http://by16fd.bay16....ex/HMAtchmt.ocx
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn...pdownloader.cab
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://www.pandasoft.../as5/asinst.cab
O18 - Filter: text/html - {75512D81-A209-11D9-B1FD-0010E0B52BEE} - C:\WINDOWS\SYSTEM\NODKCAA.DLL
O18 - Filter: text/plain - {75512D81-A209-11D9-B1FD-0010E0B52BEE} - C:\WINDOWS\SYSTEM\NODKCAA.DLL
thanks again