Do a malware check with a few malware scan programs.
You need to use all programs because each detects different malware.
Make sure that you update each program to get the latest version of the database before doing a scan.

• http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
• http://www.superantispyware.com/ - SuperAntispyware
• http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
• http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free
• http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page

See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked and What to do when searches take you to the wrong search website

If you can't fix it with the above listed scanners then you need to ask advise on one of the forums that specialize in malware removal mentioned in the Popups_not_blocked article.

Mozilla Firefox offers an Add-On to cure this problem

SOLVED Even after malware removal still had the problem......mozilla support chat had me check some setting and found that the malware reset mozilla to connect to a proxy server.....set to no proxy to finish the repair!!!!!!!!!!

THANKS!!!

I fixed this problem by removing temporary Java files and programs. In Windows 7 - Start -> Control Panel -> Programs -> Java -> Temporary Internet Files (bottom pane of first panel) -> Settings -> Delete Files -> OK. No more redirect problems. YMMV, but it's a harmless thing to try as a quick first step. Takes about 30 seconds.