How to get apk for Installed Android App

I was trying to get apk for installed apps on adroid and question was.

- where are the apk files stored on android phone

- How to Download APK files from Android Market to PC

Solution 1: For Rooted Phone

      Preinstalled applications are in /system/app folder. User installed applications are in /data/app. I guess you can't access unless you have a rooted phone. 

Solution 2: Non Rooted Phone

      If you just want to get .apk file of something you previously installed just do this:

     1. get AirDroid from Market (Google Play)

     2. access you phone using AirDroid from your PC web browser

     3. go to Apps, select preinstalled or installed app

     4. click 'download' button to downlaod .apk version of this app from you phone

you don't have to root your phone or use adb tool.

Solution 3: Non Rooted Phone

    1. Install Root Explorer or ES file explorer

    2. take backup of apps

    3. and you can find apps in /apps/backup/

Solution 4: Using Apk Downloader tool 

           Follow from here..

Fix installation of codec c or codec v plugin to watch videos

You ever had this problem when try to watch videos online it often says You need to install the codec-c or codec-v plugin!
Is this legitimate or a virus? how do I watch the videos?

The Answer is :
The 'plugin' is not needed to watch videos, It's just an ad covering the video so suggestion is DO NOT INSTALL! 

You can get rid of it by following this tutorial/video:

This will work like a charm! The important thing is that the 'plugin' is most probably a virus so again don't install!