Why can't I open certain apps?

[AC Question]

I can't open certain apps

The problem started when my phone wasn't charging. It would go up to 2% then drop down to 0 while connected to the charger. It finally stopped somehow and now it looks exactly as if my phone was reset, but I still have my apps, contacts, etc. Problem is, certain apps aren't on the app pages, so I can't open them. I tried opening an app in the Play Store, but the open button wasn't there. Is there any other way to open apps?

 

[B. Diddy]

Re: I can't open certain apps

Welcome to Android Central! Which phone? Have you tried a new battery? What do you mean that certain apps aren't on the app pages? Do you mean they're not in the App Drawer? Do you see them in ​Settings>Apps>All?