I have had a search program called scanthenet.com take over my machine. It has taken over the the startup page and messed up google which is always intercepted and is driving me mad. I have removed references of it from the registry, but it still returns. The uninstall option at the bottom of the scanthenet page does nothing.
scanthenet.com is one of the domains you are redirected to by the Coolwebsearch Hijacker, get CWShredder from click here towards the bottom of the page, an alternate site is click here if you have problems with the main site.
Once downloaded unzip and run, ensure you hit "FIX" rather than scan only