If you use Linux be prepared for a whole whack of games that wont be supported.
Linux is mostly Command line (ive worked with Fedora Core 11 -15 doing server work)
but you can use the GUI to do alot.
And you would have to download an app called Wine (allows you to run .msi .exe files made for Windows based OS)
If your not entirely tech savvy go with XP
Okay thanks, i'll probably stick with XP then but i'll do a little research into linux first