I have a Dell Latitude E6400, which has a TPM chip. It originally came with Vista Ultimate. I took ownership of the TPM and installed Bitlocker. No problems. In November, I unencrypted the drive and upgraded the OS to Windows 7 Ultimate and re-encrypted the drive. No problems.I unencrypted the drive, did a BIOS firmware upgrade, could not get Bitlocker to turn back on. Then I re-imaged the machine with Windows 7 Enterprise. I cannot get Bitlocker to work again. I turn off the TPM and click "Turn On Bitlocker" and it turns the TPM on and reboots. Then it starts the dialogue for turning on Bitlocker, I save the key to the USB and print it, do the Bitlocker drive check and reboot, leaving the USB key in [which only contains the TPM password and the Bitlocker password]. When the laptop reboots, I get the message "Error loading operating system." I have tried several USB drives, done system repair, bootrec/ fixmbr, bootrec /fixboot, and manually rebuilt the bcd per article 927392.Help!

Hi, Here are some suggestions you can try: Rebuild Boot Configuration Database ================================ 1. Insert the Windows 7 DVD and reboot the computer. 2. When we are prompted to press a key to boot from the DVD, please press Enter or the space bar. 3. Click "Next" and click "Repair your computer". 4. In the System Recovery Options dialog box, click "Command Prompt" and type in the following command. Please press Enter at the end of each lines. BOOTREC /FIXMBR BOOTREC /FIXBOOT BOOTREC /REBUILDBCD BOOTREC /SCANOS 5. If the command is successful, please close the Command Prompt window and reboot the computer. If the issue persists, try the following steps: Configure the boot method ================= 1. Open a CMD prompt on Windows XP and run the following commands, replacing “C:” in the commands with the drive letter for the system partition: Attrib –h –s –r c:\ntldr Attrib –h –s –r c:\bootmgr ren c:\ntldr ntldr.old copy c:\bootmgr ntldr 2. Restart the computer. The next boot should show the Windows 7 boot manager menu. Use F8 to start into WinRE. 3. Open a command prompt in WinRE and run the following commands: bootsect /nt60 SYS Copy c:\ntldr.old c:\ntldr (overwrite when prompted) 4. Restart the computer Hope it helps. Novak

Novak, Thank-you! I did not have the bitlocker problem but was getting the same error and rebuilding the boot configuration worked! You saved me hours of torment:) SJWALK