I've moved this to our Security forum, as that's where we concentrate on "spyware" problems.
At the very least, you've obviously been infected with the MySearch malware; some specific info on that can be found here:
http://www.mac-net.com/445088.page
Download and run the (free) spyware detection and removal programs listed in my sig below; they should clear out most of the crap in your system. After you've used the utilities, repost if you're still having problems.