i have install xp before was window 7 and my data was bitlocker protected but now after installing xp its show that you have to formate this drive but i dont format but i want to recover my data......pls help me.....reply soon......
If your data drive is formatted NTFS then the solution given in the previous link will be useless to you. Assuming you don't have a TPM chip, you can attach the encrypted drive externally (USB) to another system running Windows 7 Ultimate or Enterprise and attempt to open the volume. If there is a TPM chip present, and you engaged Bitlocker with TPM then you'll have to reinstall Windows 7 on that machine in order to open the volume.
You've just learned a valuable lesson. Never use a feature or function without a full understanding of how it works and what the consequences are when it no longer functions.