Is this a virus?
 

Somethings managed to take over my choice of websites a couple of weeks ago and the only way I`ve managed to get back on here is via a link. I can only get on a few sites like Autotrader,Google and a couple of others, everything else I type in the address bar gets changed to this paticular website I don`t want to be on, as it`s loading. I`ve tried allsorts of things. Deleting cookies, files, history, everything but no, the bloody thing`s still there. Tried AVG and that can`t find it. Can I do anything without backing everything up and reinstalling the OS? Just hope I can get back on here when I come off. Surely it`s a trojan horse but some form of helper file so can`t be found as a virus?

http://tomcoyote.com/hjt/

Try HighJack This, it should find anything wrong.

Cheers matey, I`ll give it a whirl now.

Almost without a doubt it's a hijacker and or re-director.
Sounds bad but not really
Get yourself copies of "Adware" and "Spybot" they are free. Run them and they will sort you out.

Delete your cookies and all temporary internet files.