Resolving Android Emulator (AVD) installation error on AMD Ryzen CPU
First - make sure the Hyper-V and Windows Hypervisor Platform is either uninstall or disabled.
Launch Android Studio, then go to Tools > SDK Manager, click on the 2nd tab named "SDK Tools", then check the box Android Emulator Hypervisor Driver for AMD Processors (installer) and click Apply to install it.
Once installed, navigate to sdk\extras\google\Android_Emulator_Hypervisor_Driver and run silent_install.bat as Administrator. Note: the Android SDK Location path can be seen in the above image in step #2.
Create your Virtual Device as described in this post.