virtualbox.org

My host is windows 11. I have several Gest OSs were working fine. Recently I started to learn docker. I installed docker for windows desktop. And almost after this, my guest os all dead. Even I create a new guest, new drive, fixed or dynamic, install windows 10. The installation was complete, and after login to guest os desktop, restart, restart, restart.

I tried to remove docker, uncheck Hyper-V and subsystem for linux, still not working. What could be the problem?

You have not disabled hyper-v. If you can run docker or WSL2 then hyper-v is still active.

If you want to run everything:
a) Docker
b) WSl2
c) VB

Then you will have to go back to VB 6.1.30.

Have a read of HMR3Init: Attempting fall back to NEM (Hyper-V is active), particularly the section on properly disabling Hyper-v.