Open File Manager.
Click the VIEW TAB on the box that just opened.
Select and tick Show hidden files, folders, and drives
Click APPLY and YES to any additional boxes that might pop up.
Navigate to the users folder and open your folder in there.
You should see a folder called AppData go in there.
Depending on how your computer was set up and user levels you should see three folders
Delete any instances of a folder called "Arduino15" in each location.
Restart you computer and try the IDE again.
If that fails you may have to uninstall and do a very good clean up (see below)
Take a look at this post HERE
Follow any steps that pertain to your situation especially CCLEANER and WISE reg cleaner.
Don't forget to put your sketches folder somewhere safe just for the moment copy paste it elsewhere.
Only then should you install your chosen version of the IDE but do it as ADMINISTRATOR. and not that this is above a user with admin rights. Google "run as administrator" for instructions.