I restored a backup of my Win7 box.
When I ran the old version of VirtualBox that I had installed before, it listed the Virtual Machines that I had installed at the time of the previous backup.
So, I uninstalled the old version of Virtual box, and re-installed the latest version of VirtualBox (which is what I had installed in the first place).
I then deleted the .VirtualBox directory from my %USERPROFILE% directory, and I copied the .VirtualBox folder that I had previously to my %USERPROFILE% directory. Now when I start VirtualBox it displays a list of the Virtual machines that I had before my computer crashed.
Note that I still have the hdd files on an external drive and they were not harmed by the os crash.
For some reason however, when I go to run those Virtual Machines, they cause the screen on my computer to go black, and the OS to seemingly freeze up (not totally though).
Is there anything else I need to do to get my old virtual machines running again?
I determined the source of the problem (my VirtualBoxes are back up and running now...except for the one with snapshots, I still need to fix that...)
The problem was that I installed True Image 2011, and two services it installs were eating up the CPU like crazy.
I stopped the two True Image services, and the problem still occurred; but after doing a backup and a fresh install of Windows 7, I installed just True Image, re-turned off the services, and found that I could use VirtualBox again.
Finally, I set a restore point in the fresh install, and installed Spyware Doctor 8.0 which seemed to be causing the issue.
For now I have rolled back the restore point, and have decided to use Windows Defender in the interim.
I have cross-posted this on the Spyware Doctor forum in the hopes that some one on either side might know why the two programs are interfering with one another.