Why does a windows virtual machine crash when I look at it through vnc?

Question

virtual box

Hello. I ran into the following problem - ubuntu 18.04 has a virtualbox, and it has a windows virtual machine, when I connect to this host ubuntu via vnc and start this windows guest axis (seven), I see it until the screen with "welcome" appears - it crashes ( Aborted ) .
That is, through vnc, I normally see this virtual machine both during the secure boot offer and during the OS boot with the seven icon, and then it dies.
Of course, not everything works well through vnc.
Thank you.

Answer 1

vnc server you have which is built into virtualbox?