NT Logon Problem after renaming c$ share

Does anyone have any ideas on how to rename a share without logging into the server via the GUI login. I have a situation where someone cannot log into their NT Server after renaming their C drive share from c$ to SBS. To make a long story short we think that our problems will be solved if we can figure out a way to set the share name back to c$ wihtout having to log into workstation thru the GUI login.

Thanx
Ess Pee