If you are talking about enabling encryption from files/folder property than,(all the link posted here may help you in recovering pwd protected files but not encrypted one)
Nothing will/should work AFAIK, key used to encrypt the file is uniquely generated for the user and now the OS is gone your key is lost and there is no way to retrieve that. In fact this is the whole purpose of encryption, file encrypted by you can only be decrypted by you and not by any other user.