More than likely this is spyware. first downlload a good spyware cleaner, Skidzy mentioned Spybot and ewido. There are others but try these first. click here
Before doing this try clearing out your folder of internet clutter first.
select tools on the top menu on IE and select 'Internet Options'. Delete all files and all cookies using the click boxes. try using it for a day or so. If the pop-ups persist as I think they might use Spybot to check for problems.
i would recommend downloading Spybot anyway regardless of whether clearing your IE folder works. there's lots of nasties out there that might not be so obvious.
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