If you reset a device, then the apps that were on it should be gone. Sounds more like they tried to reset it and save their stuff (which really doesn't reset the device, only some things). If that is the case, they will have to save their info (what info they can) on another device, and then try uninstalling the apps they are having problems with, restart (turn off and back on) the tablet, reinstall the apps, and then move the data back over to the tablet.
Now should that not work, do a "Hard Reset" of the tablet so that they can make it usable again. This will remove everything on it, hence back up what you can first.
NOTE: Doing this will clear 'all' the data on your tablet, so it is suggested you not choose this option unless you...