OK Lana, welcome to Windrivers....

Lets start at the beginning

What pc do you have? If you dont know, then go to www.belarc.com and download and run the free personal audit, post the results here (please remove the licence number listing from the post!)

Often plug and play is reliant on the bios. Moving to XP may mean that you will have to flash the bios to make it compliant. Did you run the compatibility check before putting xp on?

Did you upgrade from ME or did you do a clean install?

We will start with that and will help you through more depending on the answers you give.