Norton Ghost Error EC8F17B7

Desktop with Windows XP SP3

750GB USB WD external drive

 

Norton Ghost 14

 

After a few days of successful backups, it fails with the following message:

 

Error EC8F17B7: Cannot create recovery points for job: Drive Backup of  (C:\). Error E7D1001E: Unable to read from file. Error EBAB03F1: Insufficient system resources exist to complete the requested service.
Details: 0xE7D1001E
Source: Norton Ghost

 

I've searched on this site for a solution and cannot find one.