Yesterday I downloaded a trial copy of elements 2021. I ran it for hours deleting about 500 out of 12,500 pictures. Now it won't start up. I get an error message that the file mkl_core.dl "is either not designed to run on Windows or it contains an error"
I am thinking of unloading elements 2021 and then redownloading it. Any other suggestions.
For that kind of error (which I have never seen before), I would agree that uninstalling/reinstalling the program is your best bet. When you uninstall, I also recommend that you accept the option to delete all preference/settings files.
Uninstalling the program will not affect your catalog or any tags or albums within the catalog. The default location for the catalog is C:\ProgramData\Adobe\Elements Organizer\Catalogs\. So, it is always wise to back it up when conducting a major operation on your computer.