Miscellaneous topics that do not fit into specific categories.
1
When you first subscribed to Microsoft 365 Personal and activated Office that licence becomes associated to your Microsoft Account as a digital licence online and it is from there that you can re-install Office without the need for a product key:
https://account.microsoft.com/services/
2
To create a bootable Windows 11 USB, you will need an empty USB Flash drive (minimum 8GB).
Click this link: https://www.microsoft.com/software-download/windows11
to download the Media Creation Tool (Click on Download Tool Now), with that tool you can automatically create a bootable USB flash drive.
Then, boot your PC from the Installation Media you just created to begin installing Windows 11.
During the installation process skip the steps which ask for a product key and select the option 'I am Reinstalling Windows 11 on this PC'.