How to determine whether a computer is running a 32-bit version or 64-bit version of the Windows operating system
Windows Vista or Windows 7
If you have Windows Vista or Windows 7, there are two methods to determine whether you are running a 32-bit or a 64-bit version. If one does not work, try the other.
Method 1: View System window in Control Panel
- Click Start
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, type system in the Start Search box, and then click system in the Programs list.
- 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.
Method 2: View System Information window
- Click Start
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, type system in the Start Search box, and then click System Information in the Programs list.
- When System Summary is selected in the navigation pane, the operating system is displayed 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.
If you cannot determine the operating system bit count with these methods, go to the "Next Steps" section.
Windows XP
If you have Windows XP, there are two methods to determine whether you are running a 32-bit or a 64-bit version. If one does not work, try the other.
Method 1: View System Properties in Control Panel
- Click Start, and then click Run.
- Type sysdm.cpl, and then click OK.
- Click the General tab. The operating system is displayed as follows:
- For a 64-bit version operating system: Windows XP Professional x64 Edition Version < Year> appears under System.
- For a 32-bit version operating system: Windows XP Professional Version <Year> appears under System.
Note <Year> is a placeholder for a year.
Method 2: View System Information window
- Click Start, and then click Run.
- Type winmsd.exe, and then click OK.
- When System Summary is selected in the navigation pane, locate Processor under Item in the details pane. Note the value.
- If the value that corresponds to Processor starts with x86, the computer is running a 32-bit version of Windows.
- If the value that corresponds to Processor starts with ia64 or AMD64, the computer is running a 64-bit version of Windows.
If you cannot determine the operating system bit count with these methods, go to the "Next Steps" section.
NEXT STEPS
If you cannot use these methods to determine the operating system bit count, unfortunately this content cannot help you any further. As a next step, you might want to ask someone for help, or you might want to contact Support. For information about how to contact Support, visit the following Microsoft Web site:
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.
Source: http://support.microsoft.com/kb/827218