Here is a few commands to enable or disable Remote Desktop Protocol and Remote Assistance on Windows 7 and Windows Server 2008 or greater through the command line.
Enable RDP :
reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fDenyTSConnections /t REG_DWORD /d 0 /f
Disable RDP :
reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fDenyTSConnections /t REG_DWORD /d 1 /f
Command to open inbound RDP port (tcp-3389) on Windows Firewall :
netsh advfirewall firewall add rule name="Remote Desktop" dir=in action=allow protocol=TCP localport=3389
Enable Remote Assistance :
reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fAllowToGetHelp /t REG_DWORD /d 1 /f
Disable Remote Assistance :
reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fAllowToGetHelp /t REG_DWORD /d 0 /f