First of all how do you find out what your computer’s Windows Experience Index is?
Click on the Start button – then Control Panel -> System and Security -> System and in the next window you will see your Windows Experience Index.

If you click on the link you will see how the different hardware on your computer has been rated – your processor your graphics card, etc.

The Windows Experience Index gives your computer a “base score” that measures the capability of your computer hardware – the same “base score” is used in PCs that run Windows Vista, but for the XP users who have upgraded to Windows 7 this is something new.

The base score ranges from 1.0 to 5.9 and can serve as a guide for purchasing and adding new hardware to your computer.