Windows 7, no recovery discs
Post the error message for crying out loud already.
all dells ship with the disc. either in plastic form or digitally with instructions to create the disc on your own.
Have you used F8 to get the recovery console to start? be careful in there, be sure to read EVERYTHING before agreeing to a repair. One of the options will nuke the hard drive before reloading windows.
Repairing windows *should* fix it.