TeamViewer had been working great until today. Last time I used it was about a week ago. I use it to help my dad with his Tech issues. Today it will not connect. I tried shutting down and restarting each computer. I tried closing all running TeamViewer processes and re-installing on both computers. THey are both PCs and he is running Windows 10 and I am running Windows 7. I am not super tech savy myself, but can anyone help me?