So.. I've got a question. I am thinking which OS should I use to play games. I've got both XP and W7.

I've been using XP for few years, and it's been good. Few months ago I've switched to W7 and I don't know if it's fact, or just my imagination, but for example in LoL I see a bit less FPS in teamfights than on XP. I've managed to discover magically switch in layouts to disable aero and make my W7 literally look like Win97 but I dont know if it has any effect anyway :P

Tell me guys, which OS should I use to play games, and which one should I use just to work on? And nope, Linux does not count in.

My pc specs are rather old, but still can run CS:S, LoL and ME2 so it's enough for me:

Windows 7 Ultimate 32-bit/Windows XP Professional SP3
Intel Pentium 4 3.00 GHz
2,5 GB Ram
Nvidia GeForce 7950 GT 512 MB