Help Missing navbar

[jinh arjay]

for some reason the navbar is missing and as well the SystemUI.apk file is missing is any way to install or flash in the SystemUI.apk file ?and aslo where can i find the systemUI.apk file thanks

 

[jinh arjay]

and aslo android version 4.1.2 (JB) acer iconia b1-710

 

[jinh arjay]

Plz help I'm so sad that my navbar and status bar is also gone please help