Removing "winfixer"

Symptom: Once a while, an IE pop up window shows up with http://202.67.220.233 in the address field. This pop up window contains a false warning message and advertisements for "WinAntiVirusPro 2006, WinAntiSpyware 2006, and WinFixer 2006". The warning message said:

Attention! Security Center has detected spyware on your PC sending private information and documents to remote computer. One of processes (Win32res.exe) has just sent this information:

IP address: 66.19.202.184
Browser: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; ....
Computer OS: Windows XP
Full PC control: Gained
Sent Information: approximately 17 Megabytes

Sometime later, another IE window pops up with "http:www.winfixer.com/..." in the address field. The pop up window also contains a false warning message:

This site might require the following ActiveX control:
'WinFixer2006FreeInstall.cab' from 'WinSoftware Corporation, Inc.'.
Click here to install...

Warning: Your computer may have critical errors in registry and file system! These errors can lead to computer crashes, instability, slowness, and full system failure.

Immediate repair may be required.

To scan your computer for errors click the "Next" button below.
HijackThis Report:
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3}
- C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX
\AcroIEHelper.dll
O2 - BHO: DriveLetterAccess - {5CA3D70E-1895-11CF-8E15-001234567890}
- C:\WINDOWS\system32\dla\tfswshx.dll
O2 - BHO: ATLDistrib Object - {93C6313C-9DB4-4694-8BD0-E378C573A9AD}
- C:\WINDOWS\system32\vtsts.dll
O2 - BHO: NAV Helper - {BDF3E430-B101-42AD-A544-FADC6B084872}
- C:\Program Files\Norton Internet Security\Norton AntiVirus
\NavShExt.dll


To do: 1. Looked at IE > Internet Options > Programs > Manage Addon, and disabled:
AcroIEHlprObj Class
Adobe Acrobat Control for ActiveX
ATLDistrib Object
AUTIO__X_MS_WMA Moniker Class
DHTML Edit Control Safe for Scripting for IE5
DriverLetterAccess
HTML Document
InstallShield Update Service Agent
Java Plug-in 1.4.2_03
Java Plug-in 1.4.2_03
MetaStreamCtl Class
Real.com
SearchAssistantOC
Shockwave Flash Object
Sun Java Console
VIDEO__X_MS_WMV Moniker Class
Windows Media Player
Windows Media Player
Windows Messenger
XML Document

The following IE addons were kept enabled:

CNavExtBho Class Symantec
CHisExtBho Class Symantec
Norton AntiVirus Symantec
Norton Internet Security Symantec
Shell Name Space Microsoft for managing IE "Favorites"

Result: Winfixer 2006 problem is gone.