You can enable Remote system in a network, without going to the physical machine,just you are few steps have a look.
1.Go to Run-Regedit click on OK
2.Registry Editor will now open, now click on File then select Connect Network Registry.
3.A new window will appear, here enter the IP address or system name of the computer to which you want to enable remote Click OK
4.If you have logged in with local admin rights than , the other system registry will open directly, or else it will ask for user id and Password.
5.Now you can find the registry of that machine.
6.Now in registry browse to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server , here in the right panel side select fdenyTSConnection(REG_DWORD).
7.Change the value data from 1 (Remote Desktop Disabled) to 0 (Remote Desktop Enabled)
8.Now exit the registry.
That's it now you have completely enabled the remote connection to that machine, without restarting that machine you can now access it remotely.