Windows Boot Manager
Windows failed to start. A recent hardware or software change might be the cause. To fix the problem:
1. insert your Windows installation disc and restart your computer.
2. Choose your language settings, and click "Next."
3. Click "Repair your Computer".

If you do not have the disc, contact your system administrator or computer manufacturer for assistance.
Status: 0xc0000225.
Info: An unexpected error has occurred.

AS:

1. Power Down the Virtual Machine
2. Go to the Settings of the Virtual Machine
3. Under “System” tick on “Enable IO APIC”

Error (0xc0000225) installing Windows 8 R2 on VirtualBox