1) What virus? Cryptlocker or a clone? If so, there are plenty of tools available to decrypt your data.2) FoxPro 3.0? You seriously haven't upgraded since 1996?3) Wrong section.
You might use a 3d party program. Like DBF Repair Kit. Though it`s a paid software you can get a free demoversion here.
And don`t forget to backup as you were already recomended.