VirtualBox Failed

[will1113]

Hello, I have Win7 64-bit, and i have installed Virtual Box 5.1.6. with Oracle VM VirtualBox Extension Pack. I got in a new OS - Debian 64-bit, everything is set up, but when i want to push the button Start, immediatelly after this will come to the screen a application window with error. This is the error:
Failed to open a session for the virtual machine DebianVil.
The virtual machine 'DebianVil' has terminated unexpectedly during startup with exit code 1 (0x1).
More details may be available in 'C:\Users\Ja\VirtualBox VMs\DebianVil\Logs\VBoxHardening.log'.
Result Code: E_FAIL (0x80004005)
Component: MachineWrap
Interface: IMachine {b2547866-a0a1-4391-8b86-6952d82efaa0}

What is the problem?
I try to start Debian with switched off the antivirus, but didnt help.
In BIOS, the virtualization is enabled.
Do you know what is the problem?
Thanks for your time and your answers.

[scottgus1]

The problem will most likely be in the VBoxHardening.log mentioned in the error message.
Please post it here in the forum, in a zip folder, along with this info: Minimum info needed

[will1113]

i have done it, but thanks for your time

[socratis]

i have done it, but thanks for your time

Do you mind telling us what you've done so it may help others in the future?