Hi there,
It's depends on what version of Windows and the CPU you have installed.
But you can find out with the instructions below:
Windows 10 and Windows 8.1
- Select the Start button, then select Settings > System > About .
- At the right, under Device specifications, see System type.
Windows 7
- Select the Start button , right-click Computer, and then select Properties.
- Under System, see the system type.
Hope this helps!