Well, tibilicus is basically right, but there are other factors you'll need to consider. Most of the 64-bit processors out there (except the Intel Itanuim series) are backwards-compatible with 32-bit operating systems and applications, so they work fine in 32-bit. In order to run 64-bit O/S's, you also need 64-bit drivers - which are seldom widely available, and are ususally not as well tested & developed. So there are theoretical benefits to running a 64-bit O/S, but there can also be practical drawbacks at the current time that make those benefits doubtful. Someday, when the driver situation is resolved, that won't be a drawback. Right now, 64-bit operating systems are mostly best left to O/S geeks, who like to tinker with them.
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