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I got a pop-up that says "your system has traces of adult material on it, do you want to install drivecleaner?"
This malicious company attempts to scare you into using their software, which...(after I did some research) doesn't help you at all, but is really a cover for spyware and malware on your machine.
I am SURE that A LOT of people will fall for this (I know I almost did). The good news, at least, is that in the next version of Windows (Vista), it'll be A LOT tougher to make this happen.
Bottomline: DO NOT INSTALL DRIVECLEANER on your machine.
Ok, Mac/Linux people...go ahead now.