It doesn't come from PB. It sounds like you have a Spyware or Virus loaded. You definately should have a anti-virus program, so run that. (If not, get one. You can do a free check at Symantec.com or McAffee.com.) Also, Google for Ad-aware or Spybot-Search & Destroy. (I use both.) These are free programs that will check your PC for Spyware, which is uninvited software that will give you extra pop-ups and maybe do something like change your home page. I bet you'll find a Spyware problem.