Will: Hey, Maggie, could you give me a hand? 
Maggie: Hey, Will, sure. What’s the problem?
Will: Well, I installed the apps, as it says on the box, but they don’t work.
Maggie: Did you restart your computer before launching them?
Will: Well, no...
Maggie: Please try that and if it doesn’t work, you’ll have to redo it. 
Maggie's advice for the apps that don't work is restarting the computer.