rescue and recovery error

[sentinel0001]

Hi, all. I have a z60t. Recently I restored my system back to a backup state including all hard disk files.
The problem now is, I want to recover files created after that backup. I failed. I can select the target files in the backup derectory, but the error message is "error finding table of contents". I also tried system restore, now the error message is "the backup cannot be decrypted"! while I did not add any password for backup.

Can some one help me rescue these files? Those are precious videos of my baby!

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Mod Edit from other Moderator: After I previously locked your other thread, a different moderator locked this one. I am unlocking this one, as I believe this is the best conference for this thread.