Removed Default Share of Win NT(ADMIN$)

Hi !

I am having problem that by mistake i removed the default share of WINNT ie ADMIN$ and also in the Sharing-->Security Tab-->Permissions-->I removed share for everyone so now it is not shared for everyone.

Now when i am using any of the Application, i can't open any of the file as well as i can't save any file. These options are not working and the system becomes NOT RESPONDING.

After that i though that it may work if i restart then i restarted now no window is coming. It is rebooting but Explorer.exe is not working and Desktop is not coming.
I checked in Task Manager, most of the processed and run cmd.exe.
It is running but if i want to run Explorer.exe it is also not running telling that it can't find the path.
If i wantto change to the directoy winnt then it is Acces Denied.
I can't go to the Registry also.

Is there any solution of this without Reinstalling WinNT.

Guru