Windows to factory settings?

And I'm in the process of resetting my laptop to delete old files. Now I have the choice between "only delete files" and "delete files and clean drive".

Will the last Windows also be deleted? I didn't have Windows with me when I bought the notebook.

Viruses and Trojans are preserved in such a factory reset. You should completely flatten the part and reinstall everything. That's how you do it. But if you can't, it's better than nothing.

Sure, but that wasn't my question