Cannot install extensions for Safari. Help!

No matter what I try to do I cannot get Safari to install extensions. I have tried some of the answers others have been given for a similar problem but non of them seem to work. If anyone can tell me a way I can uninstall Safari and reinstall it again or repair it I would be incredibly grateful for your help.

Try deleting the Safari .plist
Open the Finder. From the Finder menu bar click Go > Go to Folder
Type or copy paste the following:
~/Library/Preferences/com.apple.Safari.plist
Click Go then move the com.apple.Safari.plist file to the Trash.
Quit and relaunch Safari. Try adding an extension.
The only way to reinstall Safari on a Mac running v10.8 Mountain Lion is to reinstall OS X using OS X Recovery
* Really helps to tell us exactly what you have tried that didn't work. We have no way of knowing 

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