All of my systems still run fastest on XP 32-bit for the most part. Win7 is fun to play with, but I still prefer XP for raw speed, security, and functionality.
Mine failed when trying to configure the new update after the reboot. It rolled back fine on its own but I have hidden the update for the time being just in case ...
My Computer
Computer Manufacturer/Model Number
Custom Build
OS
Windows 7 x64
CPU
Intel Core i7 975 @ 4.01Ghz
Motherboard
Asus Rampage II Extreme
Memory
Corsair Dominator 6GB DDR3 PC3-12800C8 (1600MHz)
Graphics Card(s)
EVGA GeForce GTX 295
Sound Card
SupremeFX X-Fi
Monitor(s) Displays
Samsung T260
Hard Drives
OS - Western Digital VelociRaptor 300GB
Backup - 2x 300GB and 1x 1TB External
PSU
Corsair HX 1000W
Case
Antec 1200
Cooling
CPU Watercooled - Watercool Heatkiller CPU LGA775 Rev3