1. Permanently shutting down the server via the Registry (the most accurate method)
2. Open regedit
3. Go to this path:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters
4. Create a new DWORD on the right side:
   AutoShareWks
   Value:
   0
   If the server is an operating system, the name will be different:
   AutoShareServer
5. Then restart the service or reboot the computer:

net stop lanmanserver
net start lanmanserver

or reboot.