Using System Properties

• 1). Click the Windows "Start" menu and click "Run" to launch the command box. Type "sysdm.cpl" (without quotes) and press "Enter" to launch the System Properties dialog box.
  
  
• 2). Click the "General" tab. You should see information about your operating system. If you are running a 64-bit system, you should see "Windows XP Professional x64 Edition Version" under "System." If you are running a 32-bit system, you should see just see "Windows XP" (home or professional) under "System."
  
  
• 3). Close the System Properties dialog box.
  
  

Using the System Information Window

• 1). Click the Windows "Start" menu and click "Run" to launch the command box. Type "winmsd.exe" (without quotes) and press "Enter" to launch the System Information window.
  
  
• 2). Click "System Summary" in the navigation pane and locate "Processor" under "Item" in the details pane. If the processor value starts with x86, you are running a 32-bit version of Windows. If the processor value starts with ia64 or AMD64, you are running a 64-bit version of Windows.
  
  
• 3). Close the System Information window.