Ok, I’ve been saying that Windows 7 is better, which it is. But, the problem is when you need XP applications for Windows 7 and won’t run (occasionally). Obviously, you can’t run some applications from XP to your shiny Windows 7. Here’s a solution: Dual boot your computer so you can use Windows 7, and Windows XP.
But first, you must install Windows 7 then XP, respectively. You need to partition your hard drive. To do this, you just need a disk partitioner. You can Google it to find what you need. If you have already installed Windows 7, and you just need to install Windows XP, you need to divide your drive into two partitions, for those OS. Actually, if you have Windows 7 installed already, you can use its own disk partitioner.
For instructions on how to dual boot your computer for Windows 7 and Windows XP, click here: http://www.sevenforums.com/tutorials/8057-dual-boot-installation-windows-7-xp.html
This is great if you use Windows 7 for work and Windows XP for games since it’s on a different partition, it is much safer and even better!