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Actually I have a GeForce 2 card with 64MB of VRAM
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Hello Summoner Yuna !
Yes, external video card with 64 Mb is much better than some integrated video card (built-in motherboard), but still... considering your processor which is not that fast and amount of RAM which is pretty low, plus only 64 Mb of memory on your video card, I'm pretty sure you would have some difficulties running Vista smoothly. Vista is very graphicaly demanding OS... a lot of nice effects, bells and whistles, but price must be paid. And the price is: lot of RAM, fast processor and good video card, at least 128 Mb recommended and DirectX 9 capable.
As RejZoR already mentioned... it is not the question if your computer will be able to run Vista, because most likely it will be able... but, the question is, is your computer going to be able to run Vista smoothly allowing you to see all those nice effects that comes with this new OS.
Cheers!