I got this  error while trying to login to HP ProBook laptop. Whenever I put password I got HRESULT error with 0x8007ffff code and on the bottom it just says 'OK' i press it and it goes back to the login screen. First option is to use HP recovery tools and try to use recovery/repair CD Using this option you are in risk to lose your data-Not Good. Other option is try using some other administrative account. I was able to login with local administrative account , also you can use domain Read more

Due to the risk involved, The procedure must be done very carefully. It is good first to do some training on non operational domain . To restore Active Directory DB from backup: Determine exactly the object name that needs to be restored (OU name). Reboot domain controller into authoritative restore mode. Restore the system state from last backup. Open a command window Run "ntdsutil" Type "authoritative restore", press Enter To restore a subtree, type "restore subtree" and the entire object Read more