Do new tabs in all your browsers open to trovi.com in Windows?
Go the uninstall programs and look for a Name containing 'Search Protect'. When you uninstall it, be sure to read each question carefully... the option to confirm removal is unlikely to be the highlighted button!
How did it get there?
You may have been caught out by installing an app from download.com (associated with CNET.com).
The web is full of good advice to remove the other irritating malware problems caused by using download.com but I couldn't find an explanation for this one... so here you go!!