[greffov]

I may be wrong here (I hope so...) but I vaguely remember something that windows encrypts your disk based on a password and key that is generated during the installation of windows. If your reinstall, you lose this key. I'm affraid you have a non-recoverable problem. I hope others can tell something else. Can you elaborate a bit on how exactly you encrypted the folder, what you used for that and how you did it?