I've been through the startbar, remove programs, hard-drive, user option files and many more and found nothing that seems to relate to it that i can delete.
I've also already downloaded spybot search and destroy and ran it - found nothing!
Did you try the registry editor (regedit) as well?
Be carefull not to delete anything alse though, if you find something in the registry
Probably you (well, your browser) got hijacked. There are programs that deal with exactely that problem, for example hijackthis. I never had to try it, so I can't tell you much more about it besides that it is free, was bought by a company called TrendSecure a while back and that there is a site called HijackThis.de whith an automatic analyzer for the logfiles. There's also a support forum, maybe you could ask for help there?
Downloaded, installed, sanned my pc and used the online analyzer- works without any problems (and diddn't find anything to worry about on my pc)