Hello zacsdad,
Of course the original Dell OS Reinstallation disc will work to recover the MCE installation on this Dell.
However, please be aware that the Recovery disc as a rule will erase the user partition of the hard disk drive so you'll need to copy off any data that you can't afford to lose.
If the computer cannot start into Windows, use an offline operating system disc to start the computer and run an OS that can support copying off your data. Such as BartPE, Ultimate Boot CD, etc.
For more detailed assistance, try the Dell User-to-User support forums at
http://support.dell.com or this general Microsoft forum:
http://social.answers.microsoft.com/Forums/en-US/xprepair/threads?filter=alltypes
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