Parasite removal programs.
http://reviews.cnet.com/5208-6132-0.html?forumID=32&threadID=1313&start=0 notes the five scanning tools and removal tools that are fairly safe. If one does encounter an issue, its always been damage done by the MALWARE. The most common issue being Layered Service Provider replacement which you can use LSPFIX (Hint: use http://www.google.com to find).
The thread has follow on discussions about new links if you don't want to use Google to find an item.
If those don't solve it, proceed to the next level with HIJACKTHIS.
Bob
PS. All the tools are free.
I'm sure other people have encountered this. I have been browsing around various websites and now I have a default website that i try to change but it comes back all the time.
Any ideas to return it back to my default wesite would be much appreciated.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic