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How to determine whether a computer is running a 32-bit version or 64-bit version:
1. Click Start 2. Type "system" in the Start Search box and then click system in the Programs list. 3. The operating system is displayed 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.