Windows 11? I certainly hope you mean Windows 10! If you truly downloaded a Windows 11 from somewhere, you have a virus. I would recommend scanning with malwarebytes to start. You can download that free at www.malwarebytes.org. If you downloaded windows 10, you will need to download the drivers associated with the devices in question. (Drivers are the program parts that allow the computer and printer to talk to each other. Usually they can be found by going to the support page at the manufacturers website. If your printer is an HP printer, www.HP.com, for example. As far as lost contacts, if its a virus they may be recoverable, if not they are gone. Let me know if you have any further questions or are in need of any instructions!