I recently installed browser defender by spy sweeper, but it then started popping up windows claiming there were malicious programs on my pc and demanded that I buy spydoctor. I promptly uninstalled it but the browser defender has refused to go and I cant locate it so that I remove it, I used revo unistaller advanced to remove the spydoctor. The browser defender has made my windows defender and spybot search and destroy to crash. Attempts to restore the pc did not work as the screen could not come on when I finished restoring. I had to undo the restore to have my computer which means I still have the browser defender, which my kaspersky could not neutralise or delete. Please help