@md_norman
Yes -- a complete restore, known as a factory reset, will do what you want.
If your PC is a 2016 model or newer, you should see if you can make a bootable USB recovery drive using the HP cloud recovery tool on a working PC.
The recovery drive can then be used to install Win10 and the HP drivers and utilities that originally came with your PC.
Here is the link: https://support.hp.com/us-en/document/c06162205
Once you have the PC restored, use the BitLocker Management function to print off your key and to back it up to a USB stick. That way, in the future, you will have the key available if you need it.
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