I've frequently been seeing popups that only contain the following code:
<script language=javascript>self.close();</script>
This seems to be coming from the following URL (although there was another, similiar one that I seem to have misplaced):
hxxp://kb.elidel.com/ocode_branded/sitepop.php?NovaId=&uid=1132321263:764286306&pgs=3&source=01025&creative=101657&campaign=ELI-9314&placement=104596&site=101055&ent=0&cohort=1
I can't find any malware or other weird programs running that could be causing these popups. I'm not sure if anyone else has seen these, but the only discussion on the net seems to be very recent (within the past week). It's possible that they could just be caused by an add, but if that's the case then they're probably tracking something. kb.elidel.com should, therefore, at least be added to the immunizations.