1. Open Control Panel and open Folder Option.
2. Click the View tab and check the "Show hidden files and folders" box.
3. Open My Computer to locate the following folder.
C:\windows\INF (INF is a hidden Folder)
4. Right click on SR.INF and Select install
5. After the install is finished, reboot and try again. If that fails then click here and see if the Dell boys know their stuff