You can do two way

First way

There is a “Computer” icon on Desktop, just do Right Click on that and select “Properties”, see image below

So System Properties Dialog will be open and you can see under System section, there is a property name is “System type” and value is “64-bit Operating System” (if it is a 32-bit version operating system “32-bit Operating System”), see image below

Second Way

1. Click on Start button, see image below

and type system in the Search program and file box, and then click System Information in the Programs list, see image below

So System Information dialog will be open and x64-based PC under value appears for the System type under Item. (if it is a 32-bit version operating system, x86-based PC under value appears for the System type under Item.), see image below

Posted on April 17, 2014 by Amit Pandya in Windows 7