Running Virtual Box version 4.2.18 r88780 on a computer whose operating system is Windows 7 Pro.
So the host o/s is Windows 7 and the guest o/s is Windows 2000.
Everything has been running well for over 2 years.
The user clicks on the green start arrow. They briefly see the Windows 2000 professional introduction screen.
A greenish colored box appears over the Windows 2000 professional introduction screen and slowly retreats then nothing happens. This behavior just started today (April 1)
The user sees the Windows 2000 startup screen with the rectangle odometer at the bottom. Usually, the rectangle gets filled with a blue line as the Windows 2000 o/s starts. But now nothing happens.
This problem just started. Nothing has been changed on the host operating system. No new programs have been added. No drivers have been changed.
I'm not sure if the problem is with Virtual box, the Windows 2000 operating system or something else.
How would you troubleshoot this problem?