Hi Nick,
This is what I use to enable remote desktop
(Get-WmiObject -Namespace "root\cimv2\TerminalServices" -Class Win32_TerminalServiceSetting -ComputerName XXXX).setallowtsconnections(1)
Or to be a bit more legible you could use
$computer = Get-WmiObject -Namespace "root\cimv2\TerminalServices" -Class Win32_TerminalServiceSetting -ComputerName XXXX $computer.setallowtsconnections(1)