Try getting AdAware6 from lavasoft, Spybot Search & Destroy and update, then run them. I would also suggest Hijack This v1.96 by merijn. http://www.spywareinfo.com

The last one shows you stuff that is running on your box that other tools might miss.

What I am suggesting is that the first step should be to eliminate the possibility of malware running on your box. stanger has a good point.................your version may have been infected/hijacked?

You have a lot of other good ideas posted here to follow up.

Good Luck