How Do I Know If I Have A 64-Bit Computer? 

64-bit computers are relatively new. To check to see if you are running a 32-bit operating system or a 64-bit operating system on your Windows computer: 

click Start (circle in lower left of your screen)
click Control Panel
click System and Maintenance (if this does not appear, just click System)
click System
Then look in the System section for the System type