Looking up the System Type (32-bit or 64-bit)
Follow the instructions for the version of Windows that you are using.
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Not sure? See What version of Windows does my computer have?
Windows XP
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Click Start >> Right-click My Computer.

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Click Properties.

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In the System Properties box, on the General tab under System:
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If it is a 32-bit system, nothing specific will be listed about the system type. This is the most common system type for Windows XP users.

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If it is a 64-bit system, it will state so here. This type is very uncommon for Windows XP users.
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Windows Vista
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Click Start (the Windows "flag") >> Click Computer.

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Click System properties.

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Under System >> System Type, the system type will be listed - either 32-bit or 64-bit.

Windows 7
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Click Start (the Windows "flag") >> Right-click Computer.
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Click Properties.
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Under System >> System Type, the system type will be listed - either 32-bit or 64-bit.