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ats might be a clean and safe place while those hosting the advertisers or their links to other servers may not. always good idea to keep an antivirus program with a functional antispyware feature in the background.
perhaps ad rotators (if any) run on the advertiser's server, which would be otherwise legit, could be the cause, ie. the connection to a website with the bad code may be there for an instance and gone afterwards.
You've probably picked up a virus somewhere else (hint: stop looking at porn) that takes a while to start manifesting itself.