A quick search turned up this:
http://www.computing.net/security/ww...orum/6754.html
hope it helps.
Also have a look thru the Tilted Computers forum, there's several threads on different kinds of spyware/trojans/hijackers, all with good advice.
2 more things that might help, learn about your HOSTS file and the "supertrick" (google those terms), and also try this in IE:
Tools>Internet Options>Settings>View Objects and see if there's anything wierd in there. Also maybe raise your Security level....good luck!
EDIT: Scratch the thing about the HOSTS file, and maybe that link I posted won't be of help either, since it only happens in IE and not Mozilla. But have a look anyway...Your best bet may be the View Objects/Downloaded Program Files thing.