Hello Jeff, There are 2 ways to do a re-installation of the Operating system. 1. PC Restore (Factory Image). The link would give you the steps to perform the PC Restore. [URL]  2. Re-Installation of Operating System (Clean Re-installation). To perform this step you would need the disk for the Operating system. The link mentioned below would have all the steps to Re-install the Operating System. [URL]  Once OS re-installed please download and install the drivers from the link mentioned below.[URL] Enter the service tag, choose the Operating system and download the and install the drivers.  The order in which the drivers are to installed is also very important for the computer to work fine. The link would give you the order in which the drivers should be installed. [URL] **Note: Please back up all the data before performing any of these steps, as they would erase everything from the computer.  Please write back to us if you have any further questions 
I want to  reinstall windows 7 on my XPS L502x
Need help in reinstalling windows 7