Someone Help Josh

I have this problem with the follow computer bug; adware.Serchentrix.A - I keep trying to delete it with my bit defender professional but it doens't go away. my Hijackthis shows the following:
gfile of HijackThis v1.98.2
Scan saved at 3:31:24 AM, on 9/30/2004
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:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\LEXBCES.EXE
C:\WINDOWS\system32\LEXPPS.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\System32\hkcmd.exe
C:\Program Files\Softwin\BitDefender8\bdoesrv.exe
C:\Program Files\Softwin\BitDefender8\bdswitch.exe
C:\Program Files\AIM\aim.exe
C:\Program Files\Spyware Doctor\spydoctor.exe
C:\WINDOWS\system32\cisvc.exe
C:\Program Files\Common Files\Softwin\BitDefender Communicator\xcommsvr.exe
C:\WINDOWS\system32\cidaemon.exe
C:\Program Files\Common Files\Softwin\BitDefender Scan Server\bdss.exe
C:\Program Files\Softwin\BitDefender8\vsserv.exe
c:\progra~1\softwin\bitdef~1\bdmcon.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\DOCUME~1\Owner\LOCALS~1\Temp\Temporary Directory 3 for hijackthis.zip\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page_bak = http://google.com/
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://www.buffalo.edu/myub
O2 - BHO: Yahoo! Companion BHO - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\Program Files\Yahoo!\Companion\Installs\cpn\ycomp5_5_5_0.dll
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn\ycomp5_5_5_0.dll
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\System32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\System32\hkcmd.exe
O4 - HKLM\..\Run: [BDMCon] c:\progra~1\softwin\bitdef~1\bdmcon.exe
O4 - HKLM\..\Run: [BDOESRV] C:\Program Files\Softwin\BitDefender8\\bdoesrv.exe
O4 - HKLM\..\Run: [BDNewsAgent] c:\progra~1\softwin\bitdef~1\bdnagent.exe
O4 - HKLM\..\Run: [BDSwitchAgent] C:\Program Files\Softwin\BitDefender8\\bdswitch.exe
O4 - HKLM\..\Run: [kctvjjxi] C:\WINDOWS\system32\mvydjfd.exe
O4 - HKLM\..\Run: [pkf] C:\WINDOWS\pkf.exe
O4 - HKCU\..\Run: [AIM] C:\Program Files\AIM\aim.exe -cnetwait.odl
O4 - HKCU\..\Run: [Spyware Doctor] "C:\Program Files\Spyware Doctor\spydoctor.exe" /Q
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O9 - Extra button: AIM - {AC9E2541-2814-11d5-BC6D-00B0D0A1DE45} - C:\Program Files\AIM\aim.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O16 - DPF: {15AD4789-CDB4-47E1-A9DA-992EE8E6BAD6} - http://public.windupdates.com/get_file.php?bt=ie&p=8c4f4634a6cb3563992c4afb91102a05d8cb6fabaea1d720dfb649ed4800f9e347d3b936bd4ef578beff3de5a7f1248299 b0:61c349ac2c9d0346d02ce89775140bcf
O16 - DPF: {30528230-99F7-4BB4-88D8-FA1D4F56A2AB} (YInstStarter Class) - http://us.dl1.yimg.com/download.yahoo.com/dl/installs/yinst20040510.cab
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://v5.windowsupdate.microsoft.com/v5consumer/V5Controls/en/x86/client/wuweb_site.cab?1096224775828


let me know if you can fix this!