If you want your PC fast, run Windows 98SE on your new hardware.
Vista is not what MS intended, it was 2 years late and had many functions removed due to
no time to finish them.
On the day Vista hit RTM, they told us the next Windows would be 2009 (did not say if Jan or Dec lol).
Thats now changed and the next Windows is not till 2010-11 (unless late lol), I feel Vista will be as good as XP was after SP2, XP was not that hot till XP-SP2 (MS stated aswell as many review sites that SP2 was more a new OS refresh like 98SE than a Service Pack like SP1).
What Vista was to be like (at 1m 03secs ).
http://www.youtube.com/watch?v=b9ifQvQCO7Y
For anyone who want to play DX10 games in XP, Tuff Luck.
I did not even open my free copy of Vista for 1 year due to it being unusable for me with lack of drivers for my hardware and Nvidia messing about.
I year later things had imporved so I used it and now SP1 is here there is no real reason not to use it unless you simply do not like it or have very old hardware.
Very recently Vista is showing its as fast as XP in Games etc, thats obv due to being on newer hardware, if you run a older less hungry OS on same hardware its obv going to be faster.
I think some peeps want to stand still and not advance, if that was the case we would all be still on DOS because some do not like Eye Candy.