Depends what you want it for. I use Vista, because I wanted a 64-bit operating system, as I have more than 2GB of RAM. There is a 64-bit XP variant, but it's not well supported.
http://kotaku.com/390214/vista-game-speeds-finally-catch-up-to-xpI'm guessing you're going to play games on that too considering the specs?
Want %10-%20 more frames? Install XP
Posted Kotaku Article said:If you were expecting a huge drop in performance as your eyes scanned from the XP to the Vista results, well, surprise! As many a tech analyst predicted, Windows Vista's gaming performance conundrum has largely been solved, and it was mainly due to early graphics drivers.
In fact, I'd been planning to run a few other gaming tests, but the results from these were so uninteresting that further work didn't seem merited. Love it or hate it, Vista is performing far better than it used to.
Game performance, it seems, has been exorcised from your concern when choosing a Microsoft operating system. That leaves a few other factors, of course: stability, responsiveness, eye candy, price, DirectX version, and a few other odds and ends.
It took about a year and a half, but the performance gap between Vista and its forerunner has finally evaporated.
You don't have to be playing new stuff, to be playing stuff, prozac.8600 mobile is a crap card, you won't be playing anything new.
and XP is going to give you more then a 10% at best
which would make 5 fps goto 5.5
Both operating systems work, just choose what you feel most comfertable with