os upgrade

Running Ms ME on 4 yr old machine with PII 350mhz 196meg Ram. 8gig hard drive, about 2 gig free.
Epson printer, Microtech scanner, Yamaha CDR, web cam. Lots of software. Going to upgrade to new OS. Need to learn Win 2000 for A+ exam. Any big advantages of XP over 2000 professional? System not currently networked but might be in the future.