Q: Macbook will not update from 10.9.3 to 10.9.5

My macbook wont update. In the "About This Mac" window it says I have version 10.9.3, and in the App Store it says I have updated to version 10.9.5 on 4 different dates (which I have tried to do). It also states that there are no new updates availeable.

Also; I keep getting this message when I try to enter network preferences: "There was an error in Network preference pane.". As a result I can only connect to networks that have already been registered, and sometimes I have to restart to connect after sleep.

What should I do?

Macbook Pro Retina with:
Processor  2,4 GHz Intel Core i5 (haswell)
Memory  8 GB 1600 MHz DDR3
Graphics  Intel Iris 1536 MB