Hi!
What exactly does the pop-up say? Take a picture and attach it to the topic using your phone. It could be a warning about an installed printer driver, misleading advertising, etc.
Does this pop-up not have a close button (X)? Or when you close it, does it reopen automatically?
Were you able to access the Windows settings? Try pressing Windows + I.
I need to know if you can use Windows and what message appears in the pop-up so I can help.