I have a problem ( application not installed ) please help

Hi DruidIDemon, and welcome to AF

A couple of questions might help us diagnose your problem. Where are you trying to install from ("unknown sources" shouldn't matter if it's the market/play store)? What is the actual error message (if any)? What device are you using? How much space do you have in internal memory and cache? Have you tried installing a very small app to see whether that works? And have you made any modifications, e.g. changing default install location?

 

Are you downloading apps from the play store? Or other sources? You'll get that message if the app isn't compatible with your phone or the file is corrupt.

 

Can you give us examples of stuff that doesn't work?

Regardless, I strongly recommend using Play for your downloads/installs, you know the apks are legitimate and come directly from the developers.