thanks so much for your help, after doing everything you said, this is the result...
Logfile of HijackThis v1.99.1
Scan saved at 14:07:09, on 13/11/2005
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
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\Common Files\Symantec Shared\ccProxy.exe
C:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
C:\Program Files\Norton Internet Security\ISSVC.exe
C:\Program Files\Common Files\Symantec Shared\SNDSrvc.exe
C:\Program Files\Common Files\Symantec Shared\SPBBC\SPBBCSvc.exe
C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\LEXBCES.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\LEXPPS.EXE
C:\WINDOWS\System32\Ati2evxx.exe
C:\Program Files\ewido\security suite\ewidoctrl.exe
C:\Program Files\ewido\security suite\ewidoguard.exe
C:\Program Files\Java\jre1.5.0_05\bin\jusched.exe
C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
C:\Program Files\Thomson\SpeedTouch USB\Dragdiag.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
C:\WINDOWS\system32\BtUsrBdg.exe
C:\WINDOWS\system32\BTSetBootKey.exe
C:\WINDOWS\system32\rundll32.exe
C:\Program Files\Norton Password Manager\AcctMgr.exe
C:\Program Files\Common Files\Symantec Shared\ccApp.exe
C:\PROGRA~1\BTYAHO~1\SMARTB~1\BTHelpNotifier.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\Program Files\QuickTime\qttask.exe
C:\Program Files\Microsoft AntiSpyware\gcasServ.exe
C:\WINDOWS\system32\drivers\KodakCCS.exe
C:\Program Files\Norton Internet Security\Norton AntiVirus\navapsvc.exe
C:\Program Files\Messenger\msmsgs.exe
C:\WINDOWS\System32\ScsiAccess.EXE
C:\WINDOWS\system32\slserv.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Common Files\Symantec Shared\CCPD-LC\symlcsvc.exe
C:\Program Files\MSN Messenger\msnmsgr.exe
C:\Program Files\InterVideo\Common\Bin\WinCinemaMgr.exe
C:\Program Files\Kodak\Kodak EasyShare software\bin\EasyShare.exe
C:\Program Files\BT Yahoo! Help\bin\mpbtn.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\Program Files\Microsoft AntiSpyware\gcasDtServ.exe
C:\Program Files\Extended Systems\XTNDConnect Blue Manager\XTNDConnect Blue Manager\XCBluMgr.exe
C:\WINDOWS\system32\wuauclt.exe
C:\PROGRA~1\EXTEND~1\XTNDCO~1\XTNDCO~1\SUSHIM~1.EXE
C:\Program Files\Extended Systems\XTNDConnect Blue Manager\btprot.exe
C:\PROGRA~1\EXTEND~1\XTNDCO~1\XTNDCO~1\BTUI_M~1.EXE
C:\Documents and Settings\fujitsu\My Documents\HijackThis.exe
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://uk.my.yahoo.com/
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Microsoft Internet Explorer provided by BT Yahoo! Broadband
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: CNisExtBho Class - {9ECB9560-04F9-4bbc-943D-298DDF1699E1} - C:\Program Files\Common Files\Symantec Shared\AdBlocking\NISShExt.dll
O2 - BHO: CNavExtBho Class - {BDF3E430-B101-42AD-A544-FADC6B084872} - C:\Program Files\Norton Internet Security\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: Norton Internet Security - {0B53EAC3-8D69-4b9e-9B19-A37C9A5676A7} - C:\Program Files\Common Files\Symantec Shared\AdBlocking\NISShExt.dll
O3 - Toolbar: Norton …