Format or delete C drive with using Command Prompt (CMD). This allows you to remove all data and reinstall Windows 11/10.

How to Format Computer Without a Windows CD. Whether you're looking to reinstall Windows, retire one of your company's computers, or just prepare a second hard drive for reuse, it's a good idea to ...

The command is: Format H: /P:7 The number after /P: is the number of secure erases Windows performs (so in this case it's a total of 7). Read more at the link below.