Hi One of my Windows 7 computer with Bitlocker / MBAM are getting following message in Event Viewer \ MBAM \ Admin and it repeats like that evry hour. I have searched on internet without any luck, Could any assist me? An error occured while applying MBAM policies. Volume ID:\\?\Volume{c6c03559-9df1-19e1-b9e5-78e7d1af2e96}\ Error code: 0x80310066 Details: Group policy does not permit the use of TPM-only at startup. Please choose a different BitLocker startup option.