SD, download spybot if you havent done so
http://download.com.com/3000-2144-10...ml?tag=lst-0-1
if still nothing happens download webroot
http://www.webroot.com/php/tryme.php...000&vcode=DT02
make sure to update their databases
if none of the above works the last thing i would do is run hijackthis
http://www.spychecker.com/download/d...ijackthis.html
see with it if there's any registry/spyware value that loads everytime you start your pc. If you don't recognise some registry valious its better to check on google with they are spyware or not before deleting them to avoid any damage.