How to remove administrative shares in Windows Server 2008 or 2012

Click Start, and then click
Run.

In the Open box, type
regedit, and then click OK.

Locate, and then click the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters\AutoShareServer

Note The registry subkey AutoShareServer must be set as type REG_DWORD. When this value is set to 0 (zero), Windows does not automatically create administrative shares. Be aware that this does not apply to the IPC$ share or shares that you create manually.

On the Edit menu, click
Modify. In the Value data box, type
0, and then click OK.

Exit Registry Editor.

Stop and then start the Server service. To do this, follow these steps: 

Click Start, and then click
Run.

In the Open box, type
cmd, and then click OK.

At the command prompt, type the following lines. Press Enter after each line:

net stop server
net start server

Type exit to close the Command Prompt window.