Help with hijacked computer

My browser starts with a page that SAYS about:blank , but actually shows up as one of the hijacked search pages. We've tried using CWShredder and it doesn't seem to be helping. Here's the log from HijackThis:

Logfile of HijackThis v1.97.7
Scan saved at 3:41:01 PM, on 6/19/2004
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

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\spoolsv.exe
C:\WINDOWS\system32\LEXPPS.EXE
C:\Program Files\McAfee\McAfee Shared Components\Guardian\CMGrdian.exe
C:\Program Files\Lexmark X74-X75\lxbbbmgr.exe
C:\Program Files\ABBYY FineReader 5.0 Sprint\CAgent.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
C:\Program Files\QuickTime\qttask.exe
C:\Program Files\Java\j2re1.4.2_04\bin\jusched.exe
C:\Program Files\Messenger\msmsgs.exe
C:\WINDOWS\System32\RUNDLL32.EXE
C:\Program Files\McAfee\McAfee Shared Components\Instant Updater\RuLaunch.exe
C:\Program Files\BigFix\BigFix.exe
C:\Program Files\Lexmark X74-X75\lxbbbmon.exe
C:\Program Files\McAfee\McAfee VirusScan\Avsynmgr.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\McAfee\McAfee VirusScan\VsStat.exe
C:\Program Files\McAfee\McAfee VirusScan\Vshwin32.exe
C:\Program Files\McAfee\McAfee Firewall\CPD.EXE
C:\Program Files\McAfee\McAfee VirusScan\Avconsol.exe
C:\Program Files\McAfee\McAfee Firewall\CPDCLNT.EXE
C:\Program Files\Common Files\Network Associates\McShield\Mcshield.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\HJT\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = file://C:\DOCUME~1\Greg\LOCALS~1\Temp\sp.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = file://C:\DOCUME~1\Greg\LOCALS~1\Temp\sp.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,SearchAssistant = file://C:\DOCUME~1\Greg\LOCALS~1\Temp\sp.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = file://C:\DOCUME~1\Greg\LOCALS~1\Temp\sp.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = file://C:\DOCUME~1\Greg\LOCALS~1\Temp\sp.html
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = file://C:\DOCUME~1\Greg\LOCALS~1\Temp\sp.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,HomeOldSP = about:blank
O2 - BHO: (no name) - {CF582F20-AC0E-4D34-B32A-52B04DBA1C05} - C:\WINDOWS\System32\halaaf.dll
O4 - HKLM\..\Run: [McAfee Guardian] "C:\Program Files\McAfee\McAfee Shared Components\Guardian\CMGrdian.exe" /SU
O4 - HKLM\..\Run: [Lexmark X74-X75] "C:\Program Files\Lexmark X74-X75\lxbbbmgr.exe"
O4 - HKLM\..\Run: [ABBYY Community Agent] C:\Program Files\ABBYY FineReader 5.0 Sprint\CAgent.exe
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\j2re1.4.2_04\bin\jusched.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\System32\NVMCTRAY.DLL,NvTaskbarInit
O4 - HKCU\..\Run: [McAfee.InstantUpdate.Monitor] "C:\Program Files\McAfee\McAfee Shared Components\Instant Updater\RuLaunch.exe" /startmonitor
O4 - Global Startup: BigFix.lnk = C:\Program Files\BigFix\BigFix.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office\OSA9.EXE
O9 - Extra 'Tools' menuitem: Sun Java Console (HKLM)
O9 - Extra button: ICQ (HKLM)
O9 - Extra 'Tools' menuitem: ICQ (HKLM)
O9 - Extra button: AIM (HKLM)
O9 - Extra button: Real.com (HKLM)
O9 - Extra button: MoneySide (HKLM)
O9 - Extra button: Yahoo! Messenger (HKLM)
O9 - Extra 'Tools' menuitem: Yahoo! Messenger (HKLM)
O14 - IERESET.INF: START_PAGE_URL=http://www.emachines.com
O16 - DPF: {02BF25D5-8C17-4B23-BC80-D3488ABDDC6B} (QuickTime Object) - http://www.apple.com/qtactivex/qtplugin.cab
O16 - DPF: {9F1C11AA-197B-4942-BA54-47A8489BB47F} (Update Class) - http://v4.windowsupdate.microsoft.c...8110.5372453704
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://download.macromedia.com/pub/...ash/swflash.cab

Please help! Thank you!

-Annah T.