After much research, I found a particularly nice forum post on the Dell site. The procedure works if it involves the Vundo-based Winfixer (WinAntiSpyware, WinAntiVirus, Blackworm, Amaena), which can be identified in your HJT log in the O2-BHO section, if you find any of the following names:

• MSEvents Object
• ATLDistrib Object
• MFCOptimizeClass Object
• ADOUsefulNet Object
• WTLHelper Object
• RawExecAction Object

You should download Atribune’s VundoFix.exe (ver. 4.2.34 as of 03/17/2006) located @ http://www.atribune.org/ccount/click.php?id=4 and Save to Desktop.
Then you should follow the next set of steps

1. Double-click VundiFix.exe to run it
2. Check the checkbox to Run VundoFix as a task
3. You will then receive a message saying that VundoFix will close and re-open in a minute or less
4. When it re-opens, click the Scan for Vundo button
5. Once it is done scanning for files, click the Remove Vundo button
6. You will receive a prompt asking if you want to remove the files, click Yes.
7. Upon clicking Yes, your desktop may go blank as it starts removing Vundo
8. When completed, it will prompt you to shutdown the computer. Click OK.
9. Turn your computer back on

If VundoFix worked for you, and cleared-up your WinFixer-related popup problem, then you should check to see what version of Java you’re running. There is much speculation that a “hole” in SUN’s Java, version j2re1.4.2_03 , is being exploited by WinFixer. The latest version (ver. 1.5.0_06 as of 03/08/2006) can downloaded [for free] @ http://www.java.com/en/ download/manual.jsp

Once you have installed the new version successfully, then you should Remove the older versions of Java thru the Control Panel > Add/Remove Programs area.

Good luck! Hopefully, the above steps help someone else out like it did for me. But always backup your machine regularly before attempting self-cleanup — it should be common practice anyways.