What is the problem with Vista? I love it on my computer!
Exactly how much more RAM does it take up? On a laptop with 4GB of RAM…Could this deference really matter that much? As I said above, I use Vista and my computer is always running fast!

the answer is by Steven :
Personally, I think Windows sucks in general
But Vista is better than XP

The biggest complaint people have is that the hardware requirements are a bit higher. But look at the specs of today's computers. I was at BestBuy yesterday and started looking at the computers. Almost all had multi-core processors and 2-8 gigs of RAM. Vista's requirements are nothing for today's computers

Response to additional details:
How much RAM Vista uses depends on how much you have. Vista has superior memory management. It will usually cache about 1/2 of your RAM to make your system more responsive. I've seen Vista run on as little as 256mb of RAM.