if you plan on using more than 3 gigs of RAM at some point go with x64 if you plan on using only 3 gb or less then go with x86. That is the simple answer.
It is not that the question is silly: it's uninformed. I would urge you to Google x64 and compare it with x86. Then you can decide if YOU need if for compatible applications/usage. Generally, most people with an x64 OS do not notice any difference because they do not place demands on their systems such that it matters. (Unless you are into serious number crunching, video editing, and 3-D gaming). Monk
Just bear in mind 64bit required digital signed drivers. yes there are ways round it but that defeat its intending purpose. Also some 32 bit applications are not compatible with x64 that come with 32 bit driver only.