I know this is not tractor related, but nearly knocked me off the internet.
Just finished rescuing my computer from a really bad "rootkit" virus. I work in the computer industry and not really sure what that means.
Anyway, the symptom I saw - when I clicked on a web link, every 2nd time it went to
www.get-search-results.com (DO NOT CLICK THIS LINK).
What worked for me was "Hitmanpro 3.5" from the cnet.com web site. Used their free 30-day evaluation.
Took two tries and several reboots to resolve.
If you see this behaviour, then make sure you get it resolved right away or get someone to help you.