It's the Windows logo in the bottom-left corner of the screen. Doing so invokes a pop-up menu.


If you don't see this icon, instead press ⊞ Win+X.
If you're using a laptop with a trackpad, tap the trackpad with two fingers instead of right-clicking.;
, You should see this option near the top of the pop-up menu.
 It's below the "Installed RAM" heading on this page. You'll see either "64-bit" or "32-bit" to the right of "System type"; this is your computer's bit count.
Right-click the Start icon.
Click System.
Look for the "System type" heading.
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