Failure to connect two remote computers

Hey,
Guys need serious help. I have two HP computers in my LAN. Connections are ok, I have just confirmed and was in just updating their BIOS.
I can RDP into their machines but it prompts me to say that there is a user logged in and I will boot them off. As I proceed as administrator, it locks up. Then it gives me this error message:
Remote Desktop Connection
This computer can’t connect to the computer.
The two computers couldn’t connect in the amount of time allotted. Try connecting again. If the problem continues, contact your network administrator support.
Any ideas would be awesome help.
