Getting "Installing..." for too long, during any app installation attempt I cannot install any app on my Galaxy Note 8 N5100 tablet which is rooted and uses Android 4.4.2. It takes too much time with no result.

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And this is the status of my package installer app:

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Edit:
I think I found what's the problem. This is the battery usage of my device:
You see the usage of Google play services is very high about 47%  

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I think it's the cause of these problems:  


When I try to play a film, it stops time to time
Installation of applications takes a lot of time
Battery usage is very high
The devise is warm even if I'm not using it


What should I do to solve the problem?
It's not possible to uninstall Google play services and reinstall it
Best attempts to make your phone fast and long lasting is using some powerful apps which work only of your phone is rooted. Root your phone and download apps like greenify (for battery purpose), roehsoft ram expander (for faster and smoother performance), titanium backup and link to SD (for uninstalling bloatware and transferring apps to SD card which cannot be done through setting without root. 
So u need root access for your phone to use these apps. 
Rooting your phone can be done through PC by kingoroot, volcano box, etc
And through your phone by kingroot, super su and super user.

I guess this will solve all your problems.. All the best....