Can i use pywallet to scan my pc for deleted wallet.dat files and to dump the keys from the wallet?
Yes, Pywallet can scan the hard disk with deleted or formatted disk; it can still able to read the deleted wallet or keys.
Read the thread here:
https://bitcointalk.org/index.php?topic=34028.0Then scroll down to "Read a device to find deleted keys"
Read this thread below about how he retrieves his wallet.dat file from a formatted hard drive.
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https://bitcointalk.org/index.php?topic=896633.0