i am using window 7 ultimate in my pc there it is not showing any drive other than C drive in bitlocker option, so can anyone help it out Thanks..........

Hi, May I know how many partitions on your computer? Can you see the partitions on Disk Management? I suggest updating the chipset, BIOS and hard drive driver from manufacturers website for a test, verify the hard drives are formatted with the NTFS file system. Niki Han TechNet Community Support