I found many answers on this one. These answers may not be your answer but let's try them. http://www.vistax64.com/vista-performance-maintenance/110270-backup-error-0x8000fff.html
I like that one. I see MSFT has some patch plus you see that interaction of Norton which I can't explain why Symantec rarely answers.
Ok, WHY MUST YOU USE WINDOWS BACKUP WHEN THERE ARE SO MANY OTHER CHOICES?
Getting the above along with "disc scan system error-memory dump files". I cannot back up my hard drive. The problem is in Vista (64 bit) but no one has an answer. Now experiencing issues in Outlook and Word. I believe all related.