Hey @Micha
There is no extra hardware installed. Just a bluetooth mouse.
Steam overlay is disabled.
But i am under the impression that Acer modifies the drivers for their hardware, if this is the case, it may be a big problem.
Latest drivers from acer is 359.00 for nvidia, and 20.19.15.4352 for the intel HD 530.
I have just tried to install both those drivers, and then Niche starts and works correctly, but other games crash.
I think i finally have figured it out.
windows update installs newer drivers for both nvidia and intel hd530 graphic controller.
So i disabled the automatic driver update, and downgraded the HD530 driver to the latest provided by acer(20.19.15.4352).
With the acer version of the HD 530 driver installed, the latest nvidia driver from nvidia started to function(436.48).
So maybe something is custom in this driver.
Now everything works
So, if anybody with a predator 17 G9-791 have problems with nvidia, it may be worth to try the onboard graphic driver from acer first.
Thanks for the help