virtualbox.org

I have got a "a critical error has occurred while running the virtual machine and the machine execution" message while I was trying to boot up a red hat 64 bit linux, I have tried some of the previous posts solutions but nothing worked for me.
I'm working on Windows 10 pro, 64 bit
I work with 12 ram and intel i5-2400 CPU
I have enabled Virtualization from bios already
now I cant reach a solution
so any help pls?

00:00:05.093292 HM: HMR3Init: Attempting fall back to NEM: VT-x is not available
00:00:05.173321 NEM: WHvCapabilityCodeHypervisorPresent is TRUE, so this might work...

Hyper-v is enabled. See post 3 of FAQ: I have a 64bit host, but can't install 64bit guests.