Unable to open backup archive??? makes no sense!

I have had a Vista Home Premium notebook for a bit under 3 months.

I use True Image 11 to backup.
Never have, never will, use the built-in Windows Backup.

A few minutes ago, a screen popped up indicating that the system was unable
to open a backup archive.

What archive?
I've never run Backup.

Each time I clicked OK, the message re-appeared, so I had to Shut Down.
Message has net yet re-appeared after reboot.

What does the message mean?
Where are the event logs in Vista?

How can I shut off Backup forever?

I found the Vista Event logs, now to see whether I can find the message.