I've been hijacked!

I've been hijacked by topotun.com search-engine please help. below is my log from Hijack This:

Logfile of HijackThis v1.97.7
Scan saved at 2:05:33 AM, on 6/11/2004
Platform: Windows 2000 SP4 (WinNT 5.00.2195)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

Running processes:
C:\WINNT\System32\smss.exe
C:\WINNT\system32\winlogon.exe
C:\WINNT\system32\services.exe
C:\WINNT\system32\lsass.exe
C:\WINNT\system32\svchost.exe
C:\WINNT\system32\spoolsv.exe
C:\Program Files\McAfee\McAfee VirusScan\Avsynmgr.exe
C:\WINNT\System32\svchost.exe
C:\WINNT\system32\gearsec.exe
C:\WINNT\system32\regsvc.exe
C:\WINNT\system32\MSTask.exe
C:\WINNT\system32\stisvc.exe
C:\WINNT\System32\WBEM\WinMgmt.exe
C:\WINNT\system32\MsPMSPSv.exe
C:\WINNT\system32\svchost.exe
C:\Program Files\McAfee\McAfee VirusScan\VsStat.exe
C:\Program Files\McAfee\McAfee Firewall\CPD.EXE
C:\WINNT\Explorer.EXE
C:\Program Files\McAfee\McAfee Firewall\CPD.EXE
C:\Program Files\McAfee\McAfee VirusScan\Vshwin32.exe
C:\Program Files\Common Files\Network Associates\McShield\Mcshield.exe
C:\Program Files\McAfee\McAfee VirusScan\Avconsol.exe
C:\PROGRA~1\Java\J2RE14~1.2\bin\jusched.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\Program Files\QuickTime\qttask.exe
C:\WINNT\system32\spool\DRIVERS\W32X86\3\E_S4I2D1.EXE
C:\Program Files\iPod\bin\iPodService.exe
C:\WINNT\system32\spool\drivers\w32x86\3\hpztsb03.exe
C:\documents and settings\jose-karla\local settings\temp\4TShvCe.exe
C:\Program Files\McAfee\McAfee Shared Components\Instant Updater\RuLaunch.exe
C:\Program Files\Sony Handheld\HOTSYNC.EXE
C:\Program Files\WinZip\WZQKPICK.EXE
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\WINNT\Downloaded Program Files\CONFLICT.1\IEengine.exe
C:\PROGRA~1\WINZIP\winzip32.exe
C:\unzipped\hijackthis[1]\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://topotun.com/sp.htm
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://red.clientapps.yahoo.com/cus...rch/search.html
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://topotun.com/index.htm
O2 - BHO: (no name) - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\PROGRA~1\Yahoo!\COMPAN~1\Installs\cpn\ycomp5_3_12_0.dll
O2 - BHO: (no name) - {029BB53A-C312-4b09-9B4F-ED57AF027B28} - C:\WINNT\winhlp32.dll
O2 - BHO: (no name) - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {D848A3CA-0BFB-4DE0-BA9E-A57F0CCA1C13} - (no file)
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINNT\system32\msdxm.ocx
O3 - Toolbar: McAfee VirusScan - {ACB1E670-3217-45C4-A021-6B829A8A27CB} - C:\Program Files\McAfee\McAfee VirusScan\VSCShellExtension.dll
O3 - Toolbar: &Yahoo! Companion - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\PROGRA~1\Yahoo!\COMPAN~1\Installs\cpn\ycomp5_3_12_0.dll
O4 - HKLM\..\Run: [Synchronization Manager] mobsync.exe /logon
O4 - HKLM\..\Run: [kdx] C:\WINNT\kdx\KHost.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\PROGRA~1\Java\J2RE14~1.2\bin\jusched.exe
O4 - HKLM\..\Run: [iTunesHelper] C:\Program Files\iTunes\iTunesHelper.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [EPSON Stylus C84 Series] C:\WINNT\system32\spool\DRIVERS\W32X86\3\E_S4I2D1.EXE /P23 "EPSON Stylus C84 Series" /O6 "USB001" /M "Stylus C84"
O4 - HKLM\..\Run: [HPDJ Taskbar Utility] C:\WINNT\system32\spool\drivers\w32x86\3\hpztsb03.exe
O4 - HKLM\..\Run: [4TShvCe] C:\documents and settings\jose-karla\local settings\temp\4TShvCe.exe
O4 - HKCU\..\Run: [McAfee.InstantUpdate.Monitor] "C:\Program Files\McAfee\McAfee Shared Components\Instant Updater\RuLaunch.exe" /STARTMONITOR
O4 - HKCU\..\Run: [IEengine] C:\Program Files\Internet Explorer\IEengine.exe
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Program Files\Common Files\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: HotSync Manager.lnk = C:\Program Files\Sony Handheld\HOTSYNC.EXE
O4 - Global Startup: WinZip Quick Pick.lnk = C:\Program Files\WinZip\WZQKPICK.EXE
O8 - Extra context menu item: &Yahoo! Search - file:///C:\Program Files\Yahoo!\Common/ycsrch.htm
O8 - Extra context menu item: Convert for CLIÉ - C:\Program Files\Sony\Image Converter\menu.htm
O8 - Extra context menu item: Yahoo! &Dictionary - file:///C:\Program Files\Yahoo!\Common/ycdict.htm
O8 - Extra context menu item: Yahoo! &Maps - file:///C:\Program Files\Yahoo!\Common/ycdict.htm
O9 - Extra 'Tools' menuitem: Sun Java Console (HKLM)
O9 - Extra button: Messenger (HKLM)
O9 - Extra 'Tools' menuitem: Yahoo! Messenger (HKLM)
O9 - Extra button: AIM (HKLM)
O16 - DPF: {166B1BCA-3F9C-11CF-8075-444553540000} (Shockwave ActiveX Control) - http://download.macromedia.com/pub/...ector/swdir.cab
O16 - DPF: {30528230-99F7-4BB4-88D8-FA1D4F56A2AB} (YInstStarter Class) - http://download.yahoo.com/dl/installs/yinst0401.cab
O16 - DPF: {33564D57-0000-0010-8000-00AA00389B71} - http://download.microsoft.com/downl...922/wmv9VCM.CAB
O16 - DPF: {78AF2F24-A9C3-11D3-BF8C-0060B0FCC122} (AcDcToday Control) - file://C:\Program Files\AutoCAD 2000i\AcDcToday.ocx
O16 - DPF: {9F1C11AA-197B-4942-BA54-47A8489BB47F} (Update Class) - http://v4.windowsupdate.microsoft.c...8122.3817361111
O16 - DPF: {AE563720-B4F5-11D4-A415-00108302FDFD} (NOXLATE-BANR) - file://C:\Program Files\AutoCAD 2000i\InstBanr.ocx
O16 - DPF: {B9191F79-5613-4C76-AA2A-398534BB8999} (YAddBook Class) - http://us.dl1.yimg.com/download.yah...utocomplete.cab
O16 - DPF: {C6637286-300D-11D4-AE0A-0010830243BD} (InstaFred) - file://C:\Program Files\AutoCAD 2000i\InstFred.ocx
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://download.macromedia.com/pub/...ash/swflash.cab
O16 - DPF: {F281A59C-7B65-11D3-8617-0010830243BD} (AcPreview Control) - file://C:\Program Files\AutoCAD 2000i\AcPreview.ocx
O16 - DPF: {F54C1137-5E34-4B95-95A5-BA56D4D8D743} (Secure Delivery) - http://content.kontiki.com/kdx/v2.1...current/kdx.cab