If BitLocker was previously used to encrypt a drive prior to using MBAM, it is recommended that it be decrypted before the MBAM client is installed.  To do this, follow these steps:

  1. Open the BitLocker Drive Encryption applet by going to the Control Panel>System and Security>BitLocker Drive Encryption.

If using the View by icons option:

    2.  Click Turn Off BitLocker

    3.  Click Turn Off BitLocker  at the prompt

    4.  The BitLocker applet should then indicate that the drive is decrypting.  This process could take several hours but the computer will still be useable during this time.

Article number: 
105265
Last updated: 
July 28, 2016