Hi and welcome to LQ
You can use AOL and Linux - but you won't have the AOL browser. A search of the forums will bring up a large number of threads on this subject.
Also, and I may get bashed for this
, if you have a legal copy of XP you can continue to use it - call Microsoft on their freephone number (should come up during the install or on activation) and explain why you can't use it anymore. They should supply you with a new code.