Im using an Apple Airport Extreme wireless base station and connecting 2 computers on a wireless network. The computer that connects to the internet wireless has a linksys adapter that works perfectly fine. Thee only thing wrong is that i need help sharing files across the network. The files I want to share are on the computer that connects wireless and runs windows xp media center edition 2005 and tha one that connects using the modem runs windows xp also. I REALLY NEED HELP!!!!!

Start with the help and support pages in xp. See topics like networking walkthrough and file sharing. Since you say airport, this only applies to the xp part. "Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10