Open the System Information
1. Open the Start menu, and click on Programs -> Accessories -> System Tools -> System Information
Look in the System Summary
2. The System Information tool will display detailed information about your Windows operating system. Once opened it will show the "System Summary" its an overview of your computer and operating system.
3. Look for the System Type Item
On the right hand side of the window you will see a list of items. Look for the item called "System Type".
The value of this item will tell you whether your computer is 32-bit or 64-bit:
- x86-based PC: Its a 32-bit computer.
- x64-based PC: Its a 64-bit computer.