Ok. What do you mean not Dual Booting? Fedora is default to be loaded unless you choose xp. Usually, it hides the menu and says "Fedora Loading in 5 Seconds..." or something like that. When you see that, press the up arrow (or any key) and it should show the menu. You can choose XP from there, hopefully. If not, we can add it to your menu.lst file. Oh, and I am not a "Guru", not yet anyway
I just help you in what I can.
As for AIM password, can you go to AIM.com and forgot password and they email it to you? You could also get a new screen name in the mean time until you remember your password or get it emailed to you.