I've always used Windows up until a few weeks ago when I installed Windows 7. I'm very satisfied with it, and looking back to the time when Vista was released it's obvious they are based on the same platform - but performance wise Win7 is a totally new and rewamped OS. It's so much better, and just installing drivers worked like a dream - where Vista didn't find any drivers to install - I didn't need to install additional drivers after the clean install! I can probably just throw away all my drivers CDs
... well, I keep them just in case.. it's windows after all
