After you wake a Windows Vista-based portable computer from hibernation, you may receive the following error message:

Windows BitLocker Drive Encryption Information
The system boot information has changed since BitLocker was enabled.
You must supply a BitLocker recovery password to start this system.
Confirm that the boot changes to this system are authorized.
If the changes to the boot system are trusted, then disable and re-enable BitLocker.
This will reset BitLocker to use the new boot information.
Otherwise, restore the system boot information.
ENTER=Continue
Operating System: Windows Vista

This problem occurs after you enable the BitLocker Drive Encryption feature on the portable computer and then put the computer in hibernation. This problem occurs even after you disable and then re-enable the BitLocker Drive Encryption feature, as suggested in the error message.