Why can't I start the Virtual Machine I just built using VitrualBox?

Question

Everything used to work fine, but I haven't been using Virtual Box for several weeks. Now all of the sudden, I get the following exception when trying to start my Windows 10(32-Bit) VM. Note - Things were working fine several weeks ago. As far as I can tell, I haven't changed anything on my system that would cause this. The exception details are as follow:

VirtualBox - Error In supR3HardenedWinReSpawn (rc=-5640) Please try reinstalling VirtualBox. where supR3HardenedWinReSpawn what: 1 VERR_SUP_VP_THREAD_NOT_ALONE (-5640) - Process Verification Failure: The process has more than one thread

I have been researching this for some time, to avail. Any help would be greatly appreciated.

Answer 1

There is a workaround:

1. Open VMbox manager
2. Run your VM with option "Detachable start"
3. Wait a while and then use "Show" to show the screen

Detachable start option

Show the screen

My setup: Oracle VM Box 6.0 running on Win10, VM is Ubuntu 18.04

Answer 2

If you are using vagrant to boot up your Virtual machine, then in most cases the error is due to improper shutdown of the VM. A fix that worked for me is to execute vagrant halt or similar commands multiple times until you have a clean boot.