Windows Vista, 7 and 8
- Right click on the Computer icon, either in the start menu or on the desktop, and select Properties.
- Under the System heading, find the System type field.
- System type will be listed as either 32-bit or 64-bit.
- Click the Start button.
- Click Run... to open the run dialog.
- Enter msinfo32.exe and then click OK.
- Under the System Summary look for the System Type field.
- An x86-based PC is 32-bit. An x64-based PC is 64-bit.