Clicksor or Yesadvertising one have viruses which one?

Hello visitors on my site start to reporting me that they got viruses from pop-ups on my site, I am using Clicksor+Yesadvertising am wondering which one would contain viruses?

I will not try to put them back until am sure.

Thanks for help.

 

I recall a while back there was an ad network that was being used to serve malware. Can't recall off the top of my head which one though.

 

i think clicksor has.

 

http://forums.digitalpoint.com/showpost.php?p=5710824&postcount=3

 

Sometime popups cause this.. check those