oceans11, I know a bit more about our installer than you do.
I ripped out your post as your deduction about your problems are so far off base all it serves to do is to confuse and panic people.
There is nothing in our installer than gets near the video driver. There is only one registry entry made, and it points to where the game is installed. If you do not want to accept that fact, and look for where the real problem might lie, that is your choice. However, anymore nonsense about how our installer will corrupt a video driver will be yanked from the board as that opinion has no basis in reality.
The reality being, I know exactly how our installer works. I am not guessing and you are. You want something more plausible?
People who have profiles or who have forced various things off and on in the driver control panel are more likely to have problems with the new version, than those who used the defaults from the base video driver installation. Has nothing to do with the installation of the game. It has to do with how the game works versus the old version of the game.
DirectX also registers every application that uses it.
By the way, when the game runs, the CPU usage is supposed to be 100%. Microsoft designed DirectX to do exactly that. If the CPU usage is not at 100%, then you have something wrong.