Windows 7
1. Click Start, click Control Panel, click System and Security, click System. The System type: line will give you the Operating System type: (as shown in the picture below)
Windows Vista
Method 1
1. Click Start, type system in the Start Search box, and then click system in the Programs list.
2. The operating system appears as follows:
For a 64-bit version operating system: 64-bit Operating System appears for the System type...
