What tool did you use when recovering deleted files?
Maybe the files you just recently recovered is not actually the wallet.dat file.

About pywallet you can use --recover to recover your wallet.dat from the hard drive.

There is already a guide here how to do it check this link below.

- https://bitcointalk.org/index.php?topic=38004.0

Or try the command posted here below

- https://bitcointalk.org/index.php?topic=5408068.msg60653031#msg60653031