Ok, I'm going step by step doing what you told me, so:
0) Yes, I already redownloaded the game and reinstalled it, installed the latest mouse, graphics card drivers, and installed the latest version of Direct X. Result: No changes.
1) I usually play on 1650x1080, and that's the resolution I have windows on, I tried to play on different resolutions and change the resolution in windows. Result: No changes.
2) I uploaded the Log1.txt with this reply.
3) I did the DxDiag, I'm attaching it to this reply.
It may be of interest the fact that I don't actually have to start "playing" to get the bug, cause in the main menu screen, with the animation of the orcs storming the walls, there I can experiment the bug. When I move my cursor, everything, menus, graphics in the background, everything freezes until I stop moving it. I can see there is a pattern depending on the speed and the direction of the movement, but I can't identify clearly which pattern.
Thanks for your quick answer, let's hope the fix is as quick as that ;-)