I have a laptop lenovo x301 which had tpm enabled and bitlocker was turned on....last week the system was being used on battery power which drained it completely and somehow the tpm got reset and bitlocker was prompting for recovery key at every startup....i tried to turn off bitlocker...and when I tried turning it back on...it says registry configuration database is corrupt....please help....

You may run System Restore to revert the system to a previous status. If it does not work, I suggest you sfc \scannow to try to repair the components. Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.