Computer PMS again

[ZebraRampage]

All right, so my friend randomly IMed me with a link, so his IM window popped up, and my mouse happened to be at the spot of the link, and I clicked accidentally and it installed this annoying little file. It was giving me all of these popups, and whenever I was on AIM I would be sending the same message to people on my buddy list. Basically I thought I got rid of it when I did a System Restore. The file was called majic05 if anyone is interesting. It said it was MS-DOS based, and that it planted itself in the System32 file as well. I can't really find anything else about it, but my friend who also got an IM from the same person had the same thing happened, and it really screwed up his computer. My computer is fine except for when I use AIM. The same problem happens. Does anyone know anything about this?