Your message ought to have been in the main forum to get user help, not this “issues” forum. Nevertheless, what I am about to tell you should help you solve the problem.
Your PC is acting as a “server” in this instance, and somehow its list of what it can serve is corrupted, damaged and/or lost. This thread will help you resolve the problem
Although it addresss problems I had with music, it pertains to all media.files. Once you complete the steps, you will HAVE to reboot the computer so it can read the new list that gets created. If you have a lot of media, the process can take a few hours, so be patient.
