This is in case anyone else has this issue. After Microsoft's April 2017 upgrade, my VirtualBox running Laravel 4.2 stopped working. I found this in my event log files:

Faulting application name: VirtualBox.exe, version: 5.0.26.8824, time stamp: 0x578cc301
Faulting module name: VirtualBox.exe, version: 5.0.26.8824, time stamp: 0x578cc301
Exception code: 0xc0000005
Fault offset: 0x00000000000139ed
Faulting process id: 0x2ca8
Faulting application start time: 0x01d2ba0aeebae4e7
Faulting application path: C:\Program Files\Oracle\VirtualBox\VirtualBox.exe
Faulting module path: C:\Program Files\Oracle\VirtualBox\VirtualBox.exe
Report Id: 4632a9fe-85d8-4f5b-8feb-f5079407f195
Faulting package full name: