To enable RDP on a computer remotely via the command line, first download PSEXEC.exe - a tool that allows you to run a command prompt on a remote computer or simply use the Remote Command function of PDQ Inventory. 

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The command to enable RDP is: 

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reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fDenyTSConnections /t REG_DWORD /d 0 /f

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Then run the following command to enable the relevant firewall rules: 

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netsh advfirewall firewall set rule group="remote desktop" new enable=Yes

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Test the RDP connection.