programs won't open up when I click on their icon n the task bar. My computer seems to think they are running, and shows me the preview of them when I hover my mouse over them, but I cannot pull them up when I click on them.
Sounds like they are being displayed on a second monitor, perhaps unattached. Press Win-P to see the state of Second Screen. Easiest way to show all windows on one screen is to use that dialog. Otherwise you can use the window's Move menu item to bring them back. If they are not associated with a second screen you could also bring them back with Taskbar's Cascade windows command, right-click an empty spot in the Taskbar to start that procedure.
FYI
Robert Aldwinckle