x64 or x32

x86 is smaller. There is a better chance of getting drivers for your H/W (though that gap is rapidly closing). X86 is limited in the amount of memory it can address, approx 3.25GB.

X64 will address as much memory as you can throw at it - basically limited by available MBO. I've read where this limit is approx 192GB, and other places quite a bit more. Also, I believe x64 Win7 is larger (but not a lot) - the installation ISO, and the footprint both on disk and in memory.
 

My Computer

Computer Manufacturer/Model Number
Cobbled together :)
OS
Win7 Ultimate, x64
CPU
i7 920, currently NOT OC
Motherboard
Asrock X58 Deluxe
Memory
OCZ Platinum 12GB (6 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600
Graphics Card(s)
nvidia geforce 7600 gt
Sound Card
integrated
Monitor(s) Displays
Samsung SyncMaster 204t (dual monitors)
Screen Resolution
1600 x 1200
Hard Drives
WDC WD2000JS-00MHB0 ATA
WDC WD5000AAKS-65YGA0 ATA
PSU
750w
Cooling
Air, 4 120mm
x86 is smaller. There is a better chance of getting drivers for your H/W (though that gap is rapidly closing). X86 is limited in the amount of memory it can address, approx 3.25GB.

X64 will address as much memory as you can throw at it - basically limited by available MBO. I've read where this limit is approx 192GB, and other places quite a bit more. Also, I believe x64 Win7 is larger (but not a lot) - the installation ISO, and the footprint both on disk and in memory.

To add onto what SRQ said..

First, welcome to Seven Forums.

Second, if you have a 64-bit Processor you should install a 64-bit if you have more then 2GB of RAM, in most cases it still outperforms 32-bit Operating systems.
 

My Computer

Computer Manufacturer/Model Number
Custom | Whitebox
OS
Windows 7 Ultimate, OS X 10.7, Ubuntu 11.04
CPU
Intel E6750 @ 3.80GHz
Motherboard
Gigabyte GA-EP45-UD3L (Revision 1.1)
Memory
2x2GB & 2x1GB (6GB) OCZ Reaper 1066MHz @ 1080MHz
Graphics Card(s)
EVGA nVidia GTX 260 896mb (216 Core) FTW Edition
Sound Card
Realtek ALC888
Monitor(s) Displays
21" VIZIO TV
Screen Resolution
1680x1050 @ 60Hz
Hard Drives
Western Digital WD6401AALS - 640GB
Hitachi HDP725016GLA380 - 160GB
PSU
Corsair 750W
Case
NZXT Nemesis Elite
Cooling
Thermaltake SpinQ
Keyboard
Logitech Wireless S520
Mouse
Logitech Wireless S520 - Microsoft Wireless Arc Mouse
Internet Speed
Download: 20mbps, Upload: 3mbps
I had VAIO z16 RAM 4 GB with Vista Business bundle, I wonder - x86 and x64 is best for me if I want to keep VAIO software. Advice me please. (I had ready install Win7 7260x86)
 

My Computer

OS
Vista, Win 7 7600x86
CPU
Intel Core 2 Duo P8600
Motherboard
VAIO VGN-Z16S
Memory
4 GB
Graphics Card(s)
Nvidia
Sound Card
Nvidia
Screen Resolution
1600x900
Hard Drives
250 GB
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