How to Tell if Win XP Is 32 or 64-Bit?
Windows Vista comes in two different flavors, 64-bit or 32-bit. A higher bit count indicates that a computer can process more data, process data quicker, and can hold more memory. The bit count of your computer should match the bit count of your operating system for optimal performance. Figuring out the bit count of your Windows Vista operating system is simple.
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Instructions
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View System Information Window
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From the "Start" menu, click "Run." (it should be found on the right side of the "Start" menu, close to the bottom."
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Type "winmsd.exe" into the "Run" box. Click "OK."
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Select "System Summary" in the navigation window. In the details window, find "Processor" under "Item."
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Take note of the letters and numbers listed next to "Processor." If the letters and numbers are x86, the computer is running on a 32-bit operating system. If it says ia64 or AMD64, your computer is running on a 64-bit operating system. If you cannot figure out the bit count of your operating system, or if these steps didn't help, please read on.
View in Control Panel
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From the "Start" menu, click "Control Panel." (It should be found on the right side of the "Start" menu."
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Select "System" or click the system icon from the Control Panel list.
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In the menu that appears, make sure that the "General" tab is selected. If it is not, select it by clicking on it.
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Determine your operating system bit count by looking under "System." If it says "Windows XP Professional x64 Edition," your computer is running a 64-bit operating system. If it says "Windows XP Professional Version" with no bit-count listed, your computer is running a 32-bit operating system.
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Tips & Warnings
If you cannot access system tools on your computer, contact Microsoft Support.
The bit count of your operating system can also be found in the documents included with your computer or the CD that came with your operating system.
Intel Itanium computers cannot run 32-bit versions of Windows.
You cannot upgrade a 32-bit Windows XP operating system to a 64-bit operating system. You can, however, install a brand new Windows XP 64-bit operating system by purchasing the disc. It will be a fresh install and a new license will be issued.
