Windows 10: During decrypting my drive my windows10 is not starting

PolarNettles said:

Just to clarify the sequence of events:
1. You started the Bitlocker decryption process.
2. The system rebooted.
3. Windows wouldn't boot
4. You reinstalled Windows onto the same drive.
5. ???
6. You get "A recovery key was not found on this drive. The drive cannot be unlocked."

How many drives do you have? Is Windows installed to the 1TB drive?

At what point do you get the error message? Is it during installation or during boot?

Window not installed on 1 TB
1 TB has only partition with full of data
When accesing 1 TB drive, this is giving me error

spunk said:

Boot off of the Windows installer, choose your Language, then press Shift+F10 to go directly to the Command Prompt.
In the RE (recovery environment) Press Enter after typing each bold command:
i) diskpart
(ie) DISKPART >
ii) list disk
(ie) DISKPART > list disk
It now lists disk by number
you have to select the disk next with
iii) select disk <disk number>
(ie) DISKPART> Select Disk (disk number) = as listed in previous command. The selected disk now has an Asterisk next to it.
iv) clean (this erases all data on the Disk, so be sure you choose the correct one)
ie) DISKPART> clean
v) list disk
the status should be "online" and free space should be "disk size"
‘vi)exit

Thank you for reply,
I want my data back, I don't want to delete them ,

HAROON2015 said:

Window not installed on 1 TB
1 TB has only partition with full of data
When accesing 1 TB drive, this is giving me error

Have you tried Use BitLocker Repair Tool to Recover Encrypted Drive in Windows Windows 10 Tutorials ?