"Snapshot error %1" after "Failed to have success running InstallVSSProvider.."

I'm trying to install the Ghost 15 Trial on Windows 7 Pro x64. This is a pretty fresh install of Windows 7. Not some OEM pre-installed-with-extra-junk one. 

 

I had Ghost 12 installed.

 

When trying to install, it wanted to remove Ghost 12 and I told it to go ahead. The removal tool said it needed to terminate two instances of explorer.exe, and I told it to go ahead. It said it couldn't manage to do it and that I should manually terminate anything locking the files the installer needs to modify. So, I  manually terminated the remaining explorer.exe and let the installer continue.

 

The first error message I got was: "ERROR: Failed to have success running InstallVSSProvider function in MSIInstallVSSProvider Function". This is mentioned by someone else in this thread. (I tried the solution mentioned there, incidentally, with no luck)

 

The next error message(s) I got was a dialog box (apparently from Windows), saying: "No mapping between account names and security IDs was done". I received four of these messages.

 

Then, the install finished and I rebooted. I ran Ghost and everything seemed to work, until I tried to make a backup. Then, I got an error message saying "Snapshot error %1.". When I clicked on the "Show Details" button, the additional info is "Error EBAB03F1: OS error 2147754774".

 

After I clicked "OK", I was returned to the "Progress and Performance - 0%" window which reported: "Error e7b70005 running job: My Documents Backup"

 

Thinking that perhaps the uninstall of Ghost 12 didn't go right, I uninstalled Ghost 15, rebooted, and then used CCleaner to clean up any registry issues related to Ghost, Symantec Shared, etc. Then, I tried installing Ghost 15 again. I got the same sequence of install-time errors and then the same run-time errors during backup.

 

Ummm.... Help?!?! Please?!?!