I guess you mean 32bit and 64 bit. Basically this number determines the amount of memory held in the registers of the processor. The 64bit windows can only be run by a 64 bit processor, but the 32 bit version can be run by both. Most processors today are 64bit capable so I guess this won't be a problem.
One drawback about the 64bit operating system is that any very old programs and drivers may have trouble working with the operating system. Microsoft has tried to get as many drivers as possible working in 64 bit, but they haven't been able to fix everything. If you're building from new parts though there shouldn't be much trouble. If you have a 5 year old printer/scanner or something though, it might not work.
Also, if you're planning on getting over 3gb of RAM you'd want to lean towards the 64bit version of the OS. The 32bit memory system can only hold a maximum of ~3.5 gb of RAM since that's the largest block of memory it can recognize. So if you put 4 gb of ram in a 32bit computer, it'll only see the first 3.5 gigs or so. The 64 bit OS increases the maximum RAM the operating system can handle to a huge amount that you won't have to worry about getting near for a long time.
[x32 is not the correct term in this case it is x86 which is the 32bit OS and x64 is the 64bit OS]
Very Useful machan
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