Explorer home pages keeps getting changed

for starter, you may want to get the popup killer because if you surf the web alot, and getting the popup windows, you may unknowingly accept certain link and set it as your default, now some of those popups designed like a regular window but with a mis position X button (to close the window)

second, you may want to set security on a registry key in IE to lock any change

Spybot s$d cleaned my system when it happened to me, I hate to admit that I got hit to but it can happen to anyone.

Try this link:

http://www.safer-networking.org/

I am finding lately that pop-ups and BHOs are causing all kinds of problems on my customer's systems. Although cute little dancing smiley faces and pink bunnies are cute, they also install Helper Objects that are a pain. I know I'm going to take a ton of email from this, but here goes - things like Outlook Helpers (that add dumb little icons to emails) and WebSearch Toolbars have been the biggest cause of problems I've seen. Basically I've told my customers that they can send email with garbage in it nobody wants, or they can have their system running smooth - their choice. A quick little utility to find BHOs, and talk about BHOs a it can be found at http://www.definitivesolutions.com/bhodemon.htm

Good luck ...