Can't restore from my BKF file. Need a solution.

Hi friends,

I'm using Symantec Backup Exec 2012 to back up my Windows Server data as well as my computer data. Last month I created two BKF files, one for system (ABC) and another one for Windows Server (XYZ). Last week I needed to restore ABC BKF file, but I found the file corrupted. But when I checked XYZ BKF file, it was working fine. I mean I could open the file, but can't this one (ABC). Is there any one who can help me in this?

Many thanks in advance.