NT 4.0 NFR , Can it be upgraded without

On the new job about 8 weeks – moved all the users over to a new Domain and then I realize why my boss had everyone on before as “Administrator” on a workgroup…. the NTS was NFR (Not For Resale) version and only allows 5 connections.

Now that we have REAL copies of NTS – can I re-install NT over this NFR installation (as a REPAIR?) and not lose anything? Or will I have to wipe the drive clean and restart?

Looking for the best way to take NTS 4. (SP6) from NFR to Full version.
Thanks,jmoses@tagaudit.com