Will a factory data reset make my camera working again? I was having low memory on my Sony Xperia phone and while emptying space, I removed some files related to the phone camera. Since then it is showing the following error on starting the camera - 


  Error - Camera not available.


I would not like to delete all my personal data unnecessarily, otherwise.
1) You should (of course) back up your personal data first! 

2) Yes. A factory reset/clean should do the trick. That is: if the camera worked during your last system clean.