The Windows Vista Experience Index is built into Windows Vista Operating System. This benchmark evaluates your notebook on five different areas; Processor, Memory (RAM), Graphics, Gaming Graphics, and Primary Hard Drive. The scale of the Windows Experience Index ranges from 1.0 to 5.9. A higher base score generally means that your computer will perform better and faster than a computer with a lower base score, especially when performing more advanced and resource-intensive tasks. You can learn how to access it here