Config says it has Win7, correct?
Instructions are for Vista & XP, so expect some differences.
#2) System Restore returns your computer to an earlier operating state without
affecting data files. Use System Restore as the first solution for restoring
your operating system and preserving data files.
#3) Dell PC Restore by Symantec (available in Windows XP) and Dell Factory
Image Restore (available in Windows Vista) returns your hard drive to the
operating state it was in when you purchased the computer. Both
permanently delete all data on the hard drive and remove any programs
installed after you received the computer. Use Dell PC Restore or Dell
Factory Image Restore only if System Restore did not resolve your
operating system problem.