Virtualbox 5.2.12 is quite old and really buggy version
Use VirtualBox 5.2.26 instead https://www.virtualbox.org/wiki/Changelog-5.2#v26
Disable USB in VM settings, use PS/2 mode
I would if I could. :)
If you can't update your virtualization software at work, you are probably running a huge security risk. Do you not have a patching process?
If this isn't about work, then curious as to why you can't upgrade?
Re:ReactOS 0.4.11 Released
by richardwhiuk on Monday March 04, 2019 @11:07AM
(#19302257)
5.2.12 was released in May 2018. That's hardly that old. None of the fixes since then sound like security fixes (all of the releases say 'maintenance release').
random 0day that was released after may 2018: https://github.com/MorteNoir1/virtualbox_e1000_0day
Update: rebooted, pressed F12 and selected Debug. Now it works...
rebooted in normal (default) boot, works now too. Except that the new hardware wizard fails installing any drivers for audio and ethernet.
Could install Virtualbox additions. Though weirdly, the mouse stopped working, so I had to use the keyboard for that.
After that, the mouse worked again.