Please find below step for this.

1. First shutdown server and attached windows ISO or bootable drive + virtio drivers.
2. Boot server from ISO and goto the Repair your computer.
3. Select the “troubleshoot” option
4. Select “command prompt”.
5. check once your drive latter from diskpart
6. Inside CMD please type “drvload E:\amd64\2k19\viostor.inf”
7. next cmd “move d:\windows\system32\utilman.exe d:\windows\system32\utilman.exe.bak”
8. copy d:\windows\system32\cmd.exe d:\windows\system32\utilman.exe
9. Reboot
10. Once Windows has rebooted and you are at the login screen, click on the Ease of Access button (or press the Windows Key + U) and it should open a Command Prompt.
11. Type command “net user Administrator P@ssw0rd”
12. Once complete, close the Command Prompt and log in your Administrator account with the new password.
13. Now, we need to perform the cleanup task. Press Windows key + X to open the Power User menu and then select “Windows PowerShell (Admin)”. Next, type the following to move the original utilman.exe back to its place:

copy /y c:\windows\system32\utilman.exe.bak c:\windows\system32\utilman.exe
This should restore the original functionality of the Ease of Access utility.