Situation:
I upgraded to 4.3.18 a few days back and everything worked fine. I was able to start all of my VM's without issue. However, Last night my PC installed updates and rebooted on its own. Today I tried starting my Linux VM and to my extreme frustration, VB cant start any of the virtual machines. Nothing starts and all fail with the same errors.
What I tried to do:
Disabling antivirus does nothing.
I also tried to uninstall 4.3.18 and roll back to 4.3.16. No dice, still the same failure message.
I then rolled back to 4.3.10 and the VM's start and boot albeit after disabling the USB controller.
Updated to 4.3.12 - again, still works.
Updated to 4.3.14 - VB wont even start the UI and throws numerous errors about dll's, see screenshot entitled 4.3.14-failure.png
Tried installing 4.3.17 testbuild and got the same errors as 4.3.16 and 4.3.18 (figured as much but wanted to cover all the bases.)
Tried uninstalling windows security updates - did nothing BUT I have yet to uninstall all listed updates.
Host system:
Windows 7 Ultimate SP1 64-bit
AMD A8-3850, 16 GB RAM
AVG Free version 2014.0.4765