download CleanUp! and run it....
*cleanup.stevengould.org/
after this, get this tool called AboutBuster and run it....
*www.malwarebytes.biz/
and scan ur system using SpyBot SnD
*security.kolla.de/
if the problem persists, post an HijckThis log file content....
get HijckThis here....
*www.spychecker.com/program/hijackthis.html