I disabled the VirtualBox network driver in the Network control panel and re-ran the scan. Similar result, although this time the crash was on

SVC: WZCSVC > C:\Windows\System32\svchost.exe

Same information in the crashbox, though:

AvastSvc.exe - Application Error
The instruction at “0x7c910f1e” referenced memory at “0x00000000”. The memory could not be “read”.
(OK/Cancel)

If we need to go deeper into stripping away VirtualBox, we can, but you may need to give me more specific guidance on that point.