I'm no expert on AOL. but I don't see why file sharing shouldn't also work. I would disable all wi-fi security until you get the wireless working, and then try WEP or WPA. Also disable all software firewalls until working.
Anyway, as you have got the wired PC working fine, that is one major problem over! Here's a few AOL fixes I have seen on these forums, but don't ask me to explain them , you'll have to just try:
+)KEYWORD : XPSP2 or SECURE FIX to download a relevant important patch from AOL.
+)Log into the router and set the MTU to 1400 for AOL.
+)AOL also issue an alternative WEP key which you must use, I just remember somone finding that it wasn't the WEP key they thought, it was found somewhere else on a web page interface?