if you can locate the data file
right click on it and select properties
UNCHECK read only hidden system
but that may not be the actual problem. There may be something else that has the file open or you may not have the security rights to the file. or a few other things
if the above does not work you might try a system restore to an earlier time when you could open the file. Or if you want to spend a little bit more I can log in remotely and fix it for you while we talk on the phone.
System restore instructions - windows 7 or 8 or 10
hold the windows logo key down and hit R
type rstrui.exe in the run box that comes up and hit enter
select restore to an earlier date.
Under the "suggested restore" which is usually not old enough to help is a link for "OTHER RESTORE POINTS"
click that if the suggested ones are not BEFORE THE PROBLEM STARTED
choose a date that is BEFORE you experienced the problem
hit ok / restore
the computer will start to shut down
a restoring settngs box will appear with a status bar
when it finishes your computer will restart with the same settings it had on the date you restored to. your data will not be affected.
It is not perfect. But it fixes a lot of things.