Don't run the AIM Screen Name Hacker
...because if you do, you'll be inviting potential data theft, Botnet drone action and lots more besides.
It never ceases to amaze me how people will fall for this kind of thing, but if you offer up TEH SEKRAT KNOWLEDGE, more often than not they'll bite your arm off to get it.
Of course, the program is a complete scam - run it, and you get a fake message telling you that "AOL has fixed the vulnerability" (click image to enlarge). What they don't tell you, is that they also dropped a boatload of goodies - well, nasties - in your System32 folder. Those files will rip the top of your PC off and scream at you in a scary, THIS IS BROKE kind of fashion.
Nice of them, isn't it?
Full writeup here.

