Hi sanyijani
Please follow these steps one by one, it is getting late here, I will be back in the morning
1
Open Disk management again
Right click that 931.5GGB space, select New - Simple Volume and accept the defaults
Close Disk Management
2
Open the Settings App
Go to Update and Security - Recovery
In the Reset Windows Section, click Get Started
Choose a local Reset and select the option to keep your files
3
When the reset completes
Run a 3rd party recovery toll on that second drive to try to recover your files