controlling BitLocker

I just replaced a motherboard for a users laptop that had TPM and BitLocker active running Vista Enterprise. I recovered his BitLocker key and it will allow him to boot to Windows. the problem is that on boot he is asked to supply that 54 digit number every time . this did not happen before the MB was replaced, how do I get them to intigrate properly?

On the laptop disable Bitlocker, reboot, then reenable Bitlocker.

thanks, I'll give that a try and let you know!