I used also the Pywallet script and still no success...
By no success, do you mean all,
1. All possible wallet found by pywallet are corrupted and you can't extract any private?
2. All possible unencrypted keys found by pywallet leads to address with no balance?
Microsoft ruined my life that day!
It could be microsoft, installed driver, installed software or your hardware.
If i have thousands Bitcoin, i won't touch closed source software.