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Download and run these two programs and the popups that Dave installed to mess with your mind and noone else's :w should disappear:
The home of Spybot-S&D! <-- Spybot Search and Destroy. It's a pretty decent program for removing most of the spyware on your machine.
Ad-Aware 2008 - Reviews and free Ad-Aware 2008 downloads at Download.com <-- Ad Aware. It can be a bit slow on older hardware but I run at least 2 spyware removal programs on my windoze boxes.
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I run Mozilla with a program called No Script that pretty much takes care of all of that unwanted stuff.