Default Launcher Crashing at Reboot, Access only to Status Bar and Settings
It seems that you have rooted your device. 

Mistakes you made:


After you got root access you have to backup all system files to your sdcard, but you did not.
No Nandroid Backups were made.
You moved system apps to the SDcard.


How to recover:


Search in your SDCard, you are missing system files with prefixes like com.android... or com.system....


If you find it, copy it to /system/app then reboot in recovery mode.

Take any of your friends' devices, root it, and then copy all system files to your PC/laptop and then copy the same to your phone into the directory /system/app/.