ASUS and all other manufacturers, are not to blame for driver issues in Windows (and Linux).
Try the pixel clock patcher and tell us your results, if that doesn't work do some basic troubleshooting.
Install the latest Windows updates.
Run the following commands in Powershell with administrator privileges one after another (after each one completes).
dism /online /cleanup-image /restorehealth
sfc /scannow
If nothing has worked so far, then the chances of you finding a fix are very slim. I'd refresh or reinstall Windows at that point.
In any case, all the pixel patcher does is change some registry entries made by the driver, so it will bypass the signature check with a modded bios. If it doesn't work, you can just reinstall the drivers.
He did reinstall the drivers though.