Help apps won't install

[Felix narh]

I was experiencing "sorry, settings has stopped" so i decided to do factory reset. After factory resetting, i noticed the sizes of internal apps turned 0 byte . Since then i can download app from play store alright but the app cannot be installed. Please, help me fix this problem.

 

[ekor]

I was experiencing "sorry, settings has stopped" so i decided to do factory reset. After factory resetting, i noticed the sizes of internal apps turned 0 byte . Since then i can download app from play store alright but the app cannot be installed. Please, help me fix this problem.

First fill this out:

phone:
Os:
Rooted?:
Custom rom?:
Custom recovery?: (if yes did u reset through there or through your settings?)