On the keyboard press the Windows Key and the Break key together.
or
Click on the Start button in the bottom left-hand corner of the screen and right-click on Computer and choose Properties.
A box should then display showing you the version of Windows you are running and which service packs you have installed.
This shows the Windows edition (Windows 7 Home Premium) and Service Pack (Service Pack 1) and, in the System section, the System type is shown explicitly as 32-bit.
32-bit or 64-bit?
Sometimes you're asked to confirm if your software is 32-bit or 64-bit? This is also displayed on the page under System Type.
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This is question number 1135, which appears in the following categories: