I concur, with 2GB of ram, unless you are planning to upgrade that to 4+ I would stick with 32 bit windows. Any version you like, but here is the comparison list so you can compare features and see which windows you think you need ^_^
My Computer
Computer Manufacturer/Model Number
Pugh Technologies
OS
W7 Professional x64
CPU
AMD Athlon II X3 445 Rana 3.10 GHz
Motherboard
MSI 870A-G54
Memory
PNY XLR DDR3 1600 4x2GB
Graphics Card(s)
NVIDIA GeForce GTS 450 (fermi) 1GB GDDR5
Sound Card
Realtek ALC892 onboard
Monitor(s) Displays
ASUS VE205t, Viewsonic VX2035WM
Screen Resolution
1600x900, 1600x1050
Hard Drives
977GB Hitachi Hitachi HDS721010CLA332
244GB Western Digital WDC WD2500AAJS-65B4A0
488GB Western Digital WDC WD5000AAJS-00A8B0
488GB Western Digital WDC WD5000AAKS-00UU3A0
PSU
Antec EarthWatts EA650 650W
Case
ThermalTake Armor A90 Mid Tower
Cooling
3x 120mm in, 1x 120mm & 200mm out, self built hydro-cooler
It is advantageous to use an X64 OS when you:
have more working memory (over 3GB)
run many programs simultaneously
have newer hardware.
Your processor will work the same under x86 and x64
My Computer
Computer Manufacturer/Model Number
Pugh Technologies
OS
W7 Professional x64
CPU
AMD Athlon II X3 445 Rana 3.10 GHz
Motherboard
MSI 870A-G54
Memory
PNY XLR DDR3 1600 4x2GB
Graphics Card(s)
NVIDIA GeForce GTS 450 (fermi) 1GB GDDR5
Sound Card
Realtek ALC892 onboard
Monitor(s) Displays
ASUS VE205t, Viewsonic VX2035WM
Screen Resolution
1600x900, 1600x1050
Hard Drives
977GB Hitachi Hitachi HDS721010CLA332
244GB Western Digital WDC WD2500AAJS-65B4A0
488GB Western Digital WDC WD5000AAJS-00A8B0
488GB Western Digital WDC WD5000AAKS-00UU3A0
PSU
Antec EarthWatts EA650 650W
Case
ThermalTake Armor A90 Mid Tower
Cooling
3x 120mm in, 1x 120mm & 200mm out, self built hydro-cooler