automatically bitlocked after change hard drive

Hello Sir/Mam

I recently installed 128gb ssd on my Vostro 15  laptop for smooth performance but i am also facing the same issue, the new ssd storage is working properly but hhd of 1 tb got locked by bitlocker i.e. my all three drives got locked and was not able to unlock it from either control panel or command prompt. I have no idea about bit- locker before and the hhd never bit locked Please help me through this asap as i have very very Important data in that drive 

Kindly response as soon as possible

Thanks 

Md Badruddin