A third party software vendor has used bitlocker to encrypt my win 8.1 pro boot drive after my purchasing some proprietary software from them. After one year I have needed to decrypt the drive for maintenance reasons. Decrypting has been blocked somehow. On the control panel I choose "Turn off Bitlocker" and the message says decrypting is in progress. A few seconds later there is an indicator saying Bitlocker is on, repeated attempts to decrypt result in the same outcome. I'm afraid there is something going on at the root level that I need advice on and I'm sure I can use the right monitor (sysinternal) tools under guidance.