Plutonium

I just installed T6 and started it. The resolution was streched and I didn't care at first but after a few minutes the game froze and later my entire screen went black, which didn't allow me to do anything. I couldn't even restart the game. The only solution was to close my computer and turn it back on. On the login screen everything was streched as well. Anyway, from that screen I was able to restart my computer with the button on the right bottom. After restarting the resolution was normal again. Any help?