Question : Problem: Backup Exec says files are inaccesible and in use - they're not!

I am using Backup Exec 2.0 to backup data to a tape drive on a machine that is used as a server in a peer to peer network.  It is not backing up critical data because it says the files are inaccessible or that they are in use by another program.  This happened before and I used the close program window to close everything but systray and explorer and that worked.  But now it is doing it again and that isn't helping.  I still get this message when all machines on the network are shut down. The attribs on the files are all set to full.  I'm lost, any suggestions?

Answer : Problem: Backup Exec says files are inaccesible and in use - they're not!

We really need to know what the files are.