I have vbox 4.1.18 running on my Windows 7 machine with several VM's (XP, Vista, Win7, Win8) and all has been well. The other night, my computer rebooted after Windows updated. When I tried to use any of the VM's yesterday, they won't load. They fail with a critical error.
I have tried repairing the installation but I am not sure what happened or how to fix it.
Any ideas?