Vista installed on my new machine worked very well at first...but patches altered its structure drastically making it very vulnerable to attack.
Exactly what the "security updates" were supposed to prevent.
Here are some items I found slowing my machine:
-services I had intentionally shut down were reset by updates to ON.
-several items were scheduled that slowed the machine.
-TMM linked an off-site SMB server to my machine that was activated every time a user logged on...even mirroring the game.

XP ran much better...faste r...smoother.. .more reliably.

If I had not already purchased this Vista Platinum Full product, I would change to XP Pro Full version.