How to tell if a Windows computer has a 64-bit CPU or OS

How you can check if your Windows computer

• Has an x86 (32-bit) or x86-64 (64-bit) processor?


• Is running a 32 bit or 64 bit operating system?

Answer

If you are on 64-bit XP, under C:\ you will see a "Program Files" as well as "Program Files (x86)" folder.

System properties will also reflect a 64-bit OS: