App Store won't open on OS X Yosemite 10.10.2

I recently updated my mac to OS X Yosemite Version 10.10.2 and during this a power cut happened. When I had finally got power back and turned on my mac it when to installing the new update as if I had just brought the mac brand new and was turning it on for the first place. After this happened and my iMac turned on I went to messages and found that it wouldn't open.
When I try to open the program I receive this:
Check with the developer to make sure that Messages Works with this version of OS X. You may need to reinstall the application. Be sure to install any available updates for the application and OS X.
I have tried to open the app store to see if there is an update but my app store won't open. When it says its loaded I click on the icon and the current program I am on does change colour at the top as if I have changed programs but nothing actually comes up. This has been happening for days please help me! I have already tried to reset warnings and caches from iTunes. And I have tried to reset safari but I can't see to find the reset button for it.
Thank you

Install or Reinstall OS X from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
      the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
4. Quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
           because it is three times faster than wireless.

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