If you need to determine wether the Windows XP or Vista operating system you use is a 32-bit or 64-bit operating system, please complete the following steps:

1. Click Start, then click on Run (in XP) or Start Search (in Vista).
2. Type msinfo32.exe and then press Enter key.
3. In “System Information”, review the value for the System Type item:
   • If the name of the System Type item is "x86-based PC", the computer is running a 32-bit edition of Windows.
   • If the name of the System Type item is "x64-based PC", the computer is running a 64-bit edition of Windows,