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
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