Two XP home mach with AOL cable

Two identical Dells with XP home and AOL broadband with linksys BEFSR41 router. One machine is FINE and the other will not surf the web. It will ping any IP, send and receive email. This machine was full of spyware – enCase, more tool bars than I’ve ever seen. However it works fine with a dial-up (AOL 8 only!). If you need more info please contact me.
Oh yes. Reinstall of XP had no effect.