I'd go with Fyron's assessment. Install 2k/xp pro, and then a linux distro.
You'll be able to run just about anything. Most games made within the past 6-7 years will run in 2k/xp. The ones that don't can either be tweaked somehow to run in 2k/xp, or will run in linux with Cedega.
The main difference between xp home and pro is that home will not let you add/remove accounts (This is different than the Users listed on the welcome screen), mess with services easily, or allow more advanced windows networking stuff (Like logging into a domain, etc). There's a complete marketing-speak breakdown at
http://www.microsoft.com/windowsxp/h...choosing2.mspx
I would also recommend buying a drive for each OS if you do dual boot. It takes alot of the complexity out of the installation and maintainance. How you dual boot depends on what Version of windows too.
Elshar