I must be doing something wrong... clients dont work at all

So I have the server installed fine and its running normally, but I cant get the clients to work at all. The windows client wont run at all, and I have reinstlled it several times. The linuc client installs and runs, I can even register it with the server, but then nothing I schedule on it ever appears on the screen.

Very frustrating, I really want to start using this software but I cannot get any client working.