bootcamp win10 audio problem

Hi everybody,

I have a problem and I need your help. Well, i have an iMac early 2011 (i5, 8GB ram, 240 ssd, macOS Mojave). Yesterday I decided to install via Bootcamp Win10. The installation succeeded and everything was just fine, expect from one thing, i have no sound! While the drivers show properly installed, however, no sound at all. I also installed drivereasy program, but does not find other drivers. Does anyone have any idea whats gong on?