Hi Ruth, I asked my husband (the tech guru who's rescued/repaired hard drives on all of my machines more times than I can count) what he thought. He says:
-restart the computer
-while it's booting up, hold the F8 key down (you have to hold it down starting before you see the Windows logo)
-then you'll see a menu (all in text)
-choose 'Safe Mode'
-fix the time while in safe mode
-then restart the computer
If it restarts normally (doesn't take 25 mins etc.) then you should be good to go. If that doesn't work then she probably has a virus. You can post back if that's the case and he'll make more suggestions.
Hope it helps!