Windows 7: 32-bit or 64-bit?

System Manufacturer/Model Number I bolted it together myself
OS Windows 7 Professional
CPU Intel Core i7 920 with stock cooler
Motherboard ASUS P6T Deluxe with OC Palm Remote (BIOS 1102)
Memory Corsair Dominator 6GB (3 x 2GB) TR3XG1600C8D DDR3 1600
Graphics Card EVGA NVIDIA GeForce 9800 GTX (G92) 512MB 256-bit GDDR3
Monitor(s) Displays Samsung SyncMaster 953BW 19"
Screen Resolution 1440 x 900

Keyboard Logitech cordless keyboard
Mouse Logitech V22 cordless optical
PSU Cooler Master 700W 80 PLUS SILVER Certified PSU
Case Antec Nine Hundred ATX Mid Tower Case (it has blue LEDs)
Cooling case has 5 fans, stock CPU fan, graphic card and PSU fans
Hard Drives Intel X25-M 80GB SSD G1 x 2EA in a RAID 0 configuration 128 KB stripe
Internet Speed Wildblue Satellite (1.5 mbps)

OS Vista H.P. SP1 x32 Seven RC x64
CPU Q6600 @ 3.4Ghz
Motherboard GA-EP45-DS3L
Memory 4Go PC2-6400
Graphics Card 8500GT @ 700/500
Sound Card Audigy Platinium
Monitor(s) Displays Mitsubishi Diamond Pro 920 + Mitsubishi Diamond Pro 720
Screen Resolution 1600x1200 twice

Keyboard MS Wireless Multimedia 6000 V2.0
Mouse IntellEye Explorer 3.0
PSU Corsair VX550W
Case Thermaltake Xaser III
Cooling Watercooling (CPU, GPU, HDD, NB)
Hard Drives Hitachi 160Go Maxtor 160Go (system drive) Maxtor 200Go in Antec MX-1 EC external box (eSATA-USB2.0)
Internet Speed ADSL 18Mbit/s/1Mbit/s