sandisk ultra 3.0 64gb

Hi, I have a sandisk ultra 3.0 64gb. I only bought it a few months ago,it worked as it should. Today i put it in my laptop and instead of seeing ( sandisk ultra) and all my files, it now says removable disk E: all the files including those pre-installed are missing. Any ideas on finding them or is there a way to go back to factory settings. and reinstall the pre installed software so that it can be recognised as ultra 3.0 again. Because it’s still quite new I can always start again with my files.

Oh forgot to say it only shows up in my laptop now… I used to play it on my TV and Satilite box but now it’s like its not there anymore

At my computer, right click the removable device and hit on Format. That should set your flash drive to factory default.