Did you Assess/Re-Assess your system with Windows Experience Index?
Did you recently update a driver
If you did not run a assessment/re-assessment or recently updated a driver click the start orb, right click "Computer" and select "Properties"
After that scroll down to your system specs where it usually shows your WEI (Windows Experience Index) score. If it needs to be re-assessed then it will say "Your system needs to be re-assessed" or something simliar to that above your WEI score.
Click that and it will take you to the WEI page and assess/re-assess your system.