Hyper-V is not working

Hello,

I have a problem with Hyper-V. To start with, I upgraded from Win7 to Win10, and I wanted to create a virtual machine. It worked, but the problem is this message: "Cannot start the virtual machine because the hypervisor is not running."

Then, I disabled the firewall, and after that, I went to Windows Features and noticed that Hyper-V could not be checked but the rest was checked. So, I did some research and typed this command in cmd: systeminfo as an admin. And I get this:

Virtual Machine Monitor Extensions: No
Virtualization Enabled in Firmware: No
Second Level Address Translation: No
Data Execution Prevention Available: Yes

But it still doesn't work; I don't know what to do.... And I need it as soon as possible...

Thank you for helping me and guiding me.

Best regards