I think Windows 7 generally runs better than Vista. IIRC Windows 8 should also use less ram than 7. My Dell Inspiron Mini 10 ran windows 8 smoothly, just couldn

I think Windows 7 generally runs better than Vista. IIRC Windows 8 should also use less ram than 7. My Dell Inspiron Mini 10 ran windows 8 smoothly, just couldn't run Metro apps because of the low resolution (there's a minimum res required).