I think Dale is pointing you in the right direction. I did a google search on your computer and video card and there seem to be some issues with that video card. Although, issues you find like that on the internet are not always all that valid. It really seems to be a video card driver issue (just my humble opinion). I believe I would do a little more research and try to contact nvidia. 2 gb of Ram should be good. I just have 1 gb and Vista home on my Toshiba laptop and it works great. I do not know if Vista business is more of a memory hog.
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