Microsoft Windows XP Professional

Method 1

1. In the Windows Start menu, select Run.
2. Type cpl, and then click OK.
3. In the System Properties dialog box, click the General 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.

Note: The <Year> variable denotes the release year of the operating system.

Method 2

1. In the Windows Start menu, select Run.
2. Type exe, and then click OK.
3. In the System Information details pane, locate the Processor
4. Note the value.

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

Microsoft Windows Server 2003

Method 1

1. In the Windows Start menu, select
2. Type cpl, and then click OK.
3. In the System Properties dialog box, click the General The operating system appears as follows:

• For a 64-bit version operating system: Microsoft Windows Server 2003 Enterprise x64 Edition appears under System.
• For a 32-bit version operating system: Microsoft Windows Server 2003 Enterprise Edition appears under System.

Method 2

1. In the Windows Start menu, select Run.
2. Type exe, and then click OK.
3. In the System Information details pane, locate the Processor
4. Note the value.

• If Processor value starts with x86, the computer is running a 32-bit version of the Windows operating system.
• If Processor value starts with EM64T or ia64, the computer is running a 64-bit version of the Windows operating system.

Windows 7, Vista, and Server 2008

Method 1

1. In the Windows Start menu, type system in the Start Search
2. In the Programs list, select System. 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. In the Windows Start menu, type system in the Start Search
2. In the Programs list, select System Information. 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.