System preferences security and privacy is greyed how do i fix it? wifi connection to public not working ether

system preferences's security and privacy are greyed out and it freezes how do i fix it? and when i try to connect to my school wifi it says that is not connected but it is how do i fix that too?

Hello NoraV,
It looks like your Security and Privacy pane is not loading at all, and is making the window unresponsive when you oepn it. I recommend checking your hard drive for errors with the following article:
Disk Utility 12.x: Repair a disk
http://support.apple.com/kb/PH5836
If the issue is not resolved, try performing the steps in this article to boot to Safe Mode, then leave it to retest the issue:
OS X: What is Safe Boot, Safe Mode?
http://support.apple.com/kb/ht1564
Starting up in Safe Mode
To start up into Safe Mode (to Safe Boot), follow these steps.
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key.
The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple logo and the progress indicator (looks like a spinning gear).
After the logo appears, you should see a progress bar during startup. This indicates that your computer is performing a directory check as part of Safe Mode.
To leave Safe Mode, restart your computer without holding any keys during startup.
Thank you for using Apple Support Communities.
All the best,
Sterling

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