I as a regular user used to work on windows 7 32bit (x86) platform, recently on 23rd march 2011, I have upgraded my PC to a new configuration with 6 GB DDR3 1333MHz PC, hence I moved from the regular 32bit to x64 or 64bit platform. My CPU is AMD Phenom II 945, it is a X86-64Bit architecture, that is, it can support both the type of platform.
Basically, I find the common designs-themes in both of them, as expected ; however they is a considerable benefit in the application processing speed. I used winrar, adobe CS5 and found the difference to be hung like about 20% gain in time.
64bit is good.