I got this pop up ad while viewing the HWA site. It proliferates like crazy, every HWA forum link clicked will generate one or more. I do have block pop ups On in my browser. Mods and Admins, can you please stop this thing, it's very annoying. Thank you! http://img197.imageshack.us/img197/3741/popx.png
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That doesn't look like something I'd expect HWA to support...either the content or the multiple pop-ups.
I'd do a security scan of your computer and if you don't find anything take it to a base-level scan cause it might be hiding itself from Windows and/or your AV software while running under a normal boot.
edit to add:
of course also consider deleting your temporary internet files and cookies
I blocked everything possible that would make these ads stop (all popups, all ads for what I think is the advertiser, etc). I also asked one of our ad agencies to look into it since they are not supposed to barrage people with popups.