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#11
Well since your system has 4gbs of ram then use 64 bit because 32bit will only let you use about 3-3.5. You wouldn't be using all your ram running in 32 bit and your system would benefit more from 64bit due to the extra memory and like mentioned in the post above. If you plan on upgrading ram at some point in the future then having 64 bit os installed would benefit you.