Windows Vista
Method 1
Click Start, then click on Run or Start Search.
Type msinfo32.exe and then press Enter key.
In “System Information”, review the value for the System Type item:
For 32-bit editions of Windows, the value of the System Type item is x86-based PC.
For 64-bit editions of Windows, the value of the System Type item is x64-based PC.
Method 2
Click Start, type system in the “Start Search” box, and then click system in the “Programs” list.
The operating system appears as follows:
For a 64-bit version operating system: 64-bit Operating System appears for the “System type” under “System”.
For a 32-bit version operating system: 32-bit Operating System appears for the “System type” under “System”.
Method 3
Click Start, type system in the “Start Search” box, and then click System Information in the “Programs” list.
The operating system appears as follows:
For a 64-bit version operating system: x64-based PC appears for the “System type” under “Item”.
For a 32-bit version operating system: x86-based PC appears for the “System type” under “Item”.
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