Problem with RiMac 5K and 295X driver Windows 10 1511

Hi,

a couple of days ago I installed the newest driver for my machine through Apple Software Update on Boot Camp Windows 10 (ver 1511, most recent build).

I have a first gen RiMac with the R9 M295X graphics cards and the new driver finally enabled 5K resolution in Windows 10. However, I could no longer access control panel and explorer.exe after the installation. Every time I click on the explorer icon in the task bar the screen flashes and that's it. I cannot open any folder anymore. And it is the same with control panel. I already tried a reinstall of the driver and the whole OS but as soon as I install the most recent driver (again, the version provided officially by Apple), I face the same issues again.

Did anyone encounter the same or similar problems with the driver? Is there maybe a fix?