How do I delete one bad TIme Machine backup?

I have an external HD on Snow Leopard which contains backups for another Snow Leopard computer and a Leopard computer.  One backup (the latest) for one Snow Leopard computer is bad, Disk Utility cannot repair it.  I tried the delete backup process described by Pondini, but the one I want to delete is greyed out in the star wars display and I cannot select it.  I would really like to recover from this so I can save the backups of the other two computers.  If it's absolutely necessary I can lose the backups for the computer which has the bad one.  Thanks for any help.

got it.
chflags nouchg boot.efi
rm boot.efi
cd
$home
Back to Trash icon on task bar, Empty Trash- File gone. Trash empty
PLEASE NOTE: I was in the trash folder. DO NOT DO THIS to your live boot.efi.
This file was as yous ee above - in the Backup - TimeMachine hierarchy, and moved to the Trash folder.

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