Windows default share C$, D$ etc are recreated on machine restart or restarting the server service. To remove these share we can add a batch file which will remove the share. This batch file can be executed every time the machine is restarted by placing it in startup folder.
Create a batch file with following text
net share c$ /delete
net share d$ /delete
and save it as shareremove.bat(as an example). You can provide any name of your choice.
Copy this file in windows startup folder.
Now every time the machine is restarted the two shared drives c$ and D$ are removed from share.