I have a few. One was an Aim message saying "Check out this photo of me". I knew it was a virus and such, but I clicked it anyways and downloaded and ran it for no reason at all. Next thing I know, I'm sending this virus Link to everyone in my buddy list and I'm trying to say not to open it. Took me a good 2 hours just to clean it out. (Sorry fatal) Another was Installing the wrong video drivers for the family computer. I couldn't get it to run and finally somehow got it to go in safe mode, and with a system restore point, I was able to make it so I didn't install the video drivers in the first place.