If you're unsure of which iteration of Windows you're running and need to know to work out what version you have to download and install a software program, or you simply want to check the specs of your machine to decide if it's time to upgrade your hardware or not, Microsoft's Windows operating system makes it really simple to find out this information.
Here's how to view your PC's RAM and processor speed in Windows 7
From the Start Menu open the Control Panel.
Scroll down to the section marked System and then select View amount of RAM and processor speed.
From the window that is dispalyed, you'll be able to see which edition of Windows your PC is running, as well as the system type, processor and amount of RAM installed.
A rating for the Windows Experience Index will also be displayed. This is a score ranging from 1.0 to 7.9 which rates your Windows experience based upon the number of calculation per second your processor makes, the memory operations per second based on the RAM, the desktop performance for Windows Aero, the gaming graphics performance and the disk data transfer rate.
You can also check that the copy of Windows you are running is activated and what the product ID is, along with the ability to change the product key if necessary.