On Windows 10, head to Settings > System > About. Look to the right of the “System type” entry. If you see “64-bit operating system, x64-based processor,” your computer is running a 64-bit operating system. If you see “32-bit operating system, x64-based processor,” your computer is running a 32-bit operating system but is capable of running a 64-bit operating system.

On Windows 7, head to Control Panel > System and Security > System. Look at “System type” to see if you’re running a 32-bit or 64-bit operating system. Windows 7’s Control Panel doesn’t show whether your CPU is 64-bit capable, so you’ll want to perform an online search for the processor name—displayed on the System screen—to find out whether it’s a 64-bit CPU if you’re currently running 32-bit Windows.