Since 2 out ot 2 people suggested firefox so blatently, I will as well, just for the heck of it.
Get Fire Fox.
Nancy, where's your sexy pic?
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Sounds like a browser hijacker to me.
Download and Run Adaware http://www.lavasoftusa.com/
and Spybot Search and destroy http://www.safer-networking.org/
If your an advance user try Hijack This http://www.spywareinfo.com/~merijn/programs.php
But you will have to remove the entries yourself.
Serenity
I'll be the fourth to suggest Firefox...
Reason? It just feels better.
make sure you get some speed addons to load pages faster:)
And all this time I was going around with the plain Firefox..
I'd start out by thoroughly scanning your PC for trojans, viruses, and spyware. If the problem persists, download the latest IE, uninstall the one currently on there, and install the new version.
If you still have trouble, get another browser.