Checking the Processor Version of Windows Vista
If you are not sure whether you are using 32-bit Windows Vista or 64-bit Windows
Vista, you can check that using the following procedure.
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Checking the Processor Version of Windows Vista
From the [Start] menu, select [Control Panel].
Click [System and Maintenance] ➞ [System].
Check the processor version of Windows Vista in [System
type].
For 32-bit Windows Vista, [32-bit Operating System] appears.
For 64-bit Windows Vista, [64-bit Operating System] appears.