Vista - Gamming experience

Im having a great time experimenting windows vista, but theres some things im
not particulary crazy about!

Meaning my gamming experience has crashed...when im playing ( online or in
singlepayer ) all the games i install ( even older games) run slowly, or dont
run at all ( for instance, one of Microsoft games "freelancer", i usually
play it in multiplayer mode, and even in the lower quality defenitions, the
game runs slow)

i've installed all the updates, graphic adapter drivers...it still run games
slow! i try that option "run as administrator", and still no change!

can u give me any tips, to make my gamming experience improve?

My system:

- MS Windows Vista "ultimate" Build 5600
- Processor: AMD Sempron 3000+ -2GHz
- Memory Ram - 1 Gb
- 250 gb Sata HD
- Graphic adapter Nvidia GeForce FX 5500
- Got an 8 mb speed connection

At this point you really need some robust hardware to get decent performance
out of games. This is pre-release software and it won't be up to par with
the final version. Drivers aren't the greatest either. All I can suggest for
right now is to disable the Aero theme, make sure you have the latest
drivers installed, and make sure you only have necessary processes running.
Otherwise you're going to need a better processor or graphic card. But don't
fret, I'm sure performance will get closer to XP's soon enough.