A lot of people have problems with the new patch.
Some are related to old drivers, other to a simple fact that your GPU is NOT supporting DirectX 11.
One solution was to run the game in SAFE mod:
The other solution is to add a special. bat file that will force start WoT in DirectX 9.
The HUGE downside of both methods - no mods work under DirectX 9
Just copy the .bat file into the main game folder and start the game using the .bat file