You sound like a new user to VirtualBox. You are expected to know some basic terms before we have a conversation. Start by reading three small chapters from the User Manual:
Or even better, read the whole chapter
1. First steps, then you'll know what "host" is.
If you can't understand English very well, try
https://www.deepl.com/translator or
https://translate.google.com/
00:00:02.540387 OS Product: Windows 10
00:00:02.540388 OS Release: 10.0.18362
That's your host's version, the information I was asking for. This is a Windows
pre-release, released on 2019-03-20 (10 days ago), moving from "Using VirtualBox" to "Windows pre-releases".
00:00:02.843112 HM: HMR3Init: Attempting fall back to NEM: VT-x is not available
00:00:02.931104 NEM: WHvCapabilityCodeHypervisorPresent is TRUE, so this might work...
It seems that you have Hyper-V enabled. Look in the "Control Panel" » "Programs and Features" » "Turn Windows features on or off", and make sure that the none of the following are active:
- Hyper-V
- Virtual Machine Platform
- Windows Hypervisor Platform
Disable Hyper-V in your host and see what happens...