How to Check Your Windows is 32 bit or 64 bit?

Windows 7
1. Click Start, click Control Panel, click System and Security, click System. The System type: line will give you the Operating System type: (as shown in the picture below)

Windows Vista
Method 1
1. Click Start, type system in the Start Search box, and then click system in the Programs list.
2. 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 2
1. Click Start, type system in the Start Search box, and then click System Information in the Programs list.
2. 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. 

Microsoft Windows XP Professional 
Method 1
1. Click Start, click Run, type sysdm.cpl, and then click OK.
2. Click the General tab. The operating system appears as follows:

• For a 64-bit version operating system: Microsoft Windows XP Professional x64 Edition Version < Year> appears under System. 
• For a 32-bit version operating system: Microsoft Windows XP Professional Version< Year> appears under System. 

Method 2
1. Click Start, click Run, type winmsd.exe, and then click OK.
2. In the details pane, locate Processor under Item. Note the value.

• If the value that corresponds to Processor starts with x86, the computer is running a 32-bit version of the Windows operating system. 
• If the value that corresponds to Processor starts with ia64 or AMD64, the computer is running a 64-bit version of the Windows operating system. 

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Categories: How to: Check Your Windows is 32 bit or 64 bit