Hi,
I have been having problems opening folders. Sometimes they are empty. Properties show 0kb. Where have my files that were in the folders gone??
Just now I tried to open an excel and got big red X "This file does not have an app associated with it . . . Please install an app or create an association . . . ." I have opened this file many times before now it's gone??
I used to have Norton and am wondering if I need to reapply for it. I have a computer tech who used to work for Microsoft tell me I didn't need any additional antivirus other than what was on the machine (Windows Defender).
What's happening??

Thanks,
(Usually I have print copies of my files, but not this one so I will have to start over if it's not recoverable)