H 다현 고,
I am Dave, I will help you with this.
1
That is an unusual notification, please provide a screenshot of that if you can.
With regards to Blitlocker, that is not available on the Home version of Windows only the Pro, Education and Enterprise editions.
w
Open File Explorer, then navigate to 'This PC, please provide a screenshot of that window, I need to see your drive(s)