My child changed my admin password and now can't remember it. I used Rufus to create a usb bootable stick from PCUnlocker Enterprise iso image and it booted successfully on my Surface Pro tablet. But the program couldn't locate the sam file and reset the password. Afterwards I booted with Ubuntu Live CD, and all my files are still inaccessible. Suddenly I realized my hard drive was encrypted with BitLocker. So the problem is how can I decrypt the hard drive? I have the BitLocker recovery key but don't know what to do next because I couldn't sign into Windows any longer. Please help!