We are presently running Windows XP SP2 with IE 7. The pop up feature is on by default. Users are able to turn it off, however, it turns back on after some time. I tried turnng mine off and than running gpudate and after gpupdate completes, pop up blocker is turned on. I looked through RSOP and gpresult /v but cannot see where it might be enabled in GPO. Is there a specific section I should be looking at or is there somewhere else this is controlled?