100% graphics card load

From today I have a problem with the graphics card. The load is 100% all the time. The problem appeared today. I did not have it before. I’ve reinstalled Zwift, reinstalled the graphics card drivers and nothing. I will not even enter the game and the load is already 100%. What happened? I can not watch the movie while driving because the graphics are jumping. My equipment is GTX 780.

 

Regards Michal Gajor from Poland