Hello! I ran into exactly the same problem.
My laptop HP Pavillion G6 2283-ER, Windows 10 pro system. The problem arose during the installation of the version at the current moment (although this is not important) CentOS-7-x86_64-Minimal-1908 (when installing the DVD version there was the same problem). Also, when indicating less than two processors, the cursor did not even blink on the gray screen.
After futile attempts to fix this (I checked the hash amount, turned on / off Hyper-V, checked and unchecked the settings of the virtual machine), I decided to try VMware Workstation.
With a similar installation, he told me the following:
"VMware Workstation and Device / Credential Guard are not compatible. VMware Workstation can be run after disabling Device / Credential Guard."
I went to google in search of a problem, and came across a video:
https://www.youtube.com/watch?v=0mB1ee3DVEQ
Here is translated instruction for you and other people that came accross this post:
1) Open the command line "WIN + R" and enter the command "gpedit.msc", click "OK".
2) In the window that opens, go to the section "Local Computer Policy - Computer Configuration - Administrative Templates - System - Device Guard".
Here, double-click on the item "Turn On Virtualization Based Security". In the window that opens, select the item "Disabled" and click "OK."
3) Go to "Control Panel - Programs and Features - Turn Windows Features on or off" and turn off Hyper-V and click "OK." The computer will offer to reboot - we refuse (we will reboot later).
4) Run the command line as administrator (cmd). On the command line, execute several commands in a row:
bcdedit / create {0cb3b571-2f2e-4343-a879-d86a476d7215} / d "DebugTool" / application osloader
Press "Enter"
bcdedit / set {0cb3b571-2f2e-4343-a879-d86a476d7215} path "\ EFI \ Microsoft \ Boot \ SecConfig.efi"
Press "Enter"
bcdedit / set {bootmgr} bootsequence {0cb3b571-2f2e-4343-a879-d86a476d7215}
Press "Enter"
bcdedit / set {0cb3b571-2f2e-4343-a879-d86a476d7215} loadoptions DISABLE-LSA-ISO, DISABLE-VBS
Press "Enter".
bcdedit / set hypervisorlaunchtype off
Press "Enter".
Reboot the computer.
5) PROFIT!
That instruction helps me to ran and VMware Workstation, and VirtualBox. Before I did that, VirtualBox Centos 7 installation hung up even I pressed down/up arrows to choose Test Centos.