if this just started please try doing a system restore to a time when it did work before we go into other trouble shooting. If that does not work i would need to know if the program itself wont open or if it wont open when you click on a data file rather than the program
System restore instructions - windows 7 8 10
hold the windows logo key and hit Rin the box that appears type
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 from the calendar that is BEFORE you experienced the problem
hit ok / restore
the computer will start to shut down
a restoring settings 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.