although your system specs are a little on the low side, you could run vista ok. the only cards that support directx 10 are the geforce 8 series which require pci-e. And i'm assuming your card doesn't support aero, what's is your video card again? if you can get the vista drivers, you'll be able to use all of the vista features, except directx 10, which is required by only the newest games like halo 2. I'd look into getting an nvidia card geforce fx 5500 or higher, as those do support aero.
but in the long run, it might be good to just buy a new comptuer.
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