How to Enable ADMIN$ and Registry service permanently ?

Server ADMIN$ Share
For NT4 Servers, Win2K Servers, and Windows Server 2003, go to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanManServer\Parameters
Name: AutoShareServer
Data Type: REG_DWORD
Value: 1
Note: A reboot is necessary for this to take effect.

Workstation ADMIN$ Share
For NT4 Workstations, Win2K Professional, XP Professional, go to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanManServer\Parameters
Name: AutoShareWks
Data Type: REG_DWORD
Value: 1
Note: A reboot is necessary for this to take effect.
If you want the administrative shares to be re-created, change the value to 1.

For the Remote Registry service
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RemoteRegistry
Name: Start
Value: 2
A value of 2 will start the remote registry service automatically.