MacBook Pro :: Activity Monitor And Console Won't Open?

I knew everything was working fine on my Macbook Pro 2.4 GHz i5, 8gb ram, Mac OS X Version 10.7.3. I loaded up my Mac this morning and tried to open Activity Monitor but wont open. When I drag the application to the dock, there is no icon picture for it. I looked on the internet and it told me to load up Console, which I then found done the same thing.

In Utilities I realised the App 'Podcast Capture' was also missing its icon, but since I do not use that, I am not worried. After looking through google again, I ended up using FirstAid and repaired the disk and permissions. That still made no difference. Finally I then decided I could delete the .plist from preferences, to then find neither of the files for Console and Activity Monitor were there? And I had not deleted them.

Once last thing, in Terminal, every time I open it, it comes up with, bash: /usr/libexec/path_helper: Unknown error: -22

Not sure if this relates to it in anyway? The only thing I know that may have effected it was setting up a Minecraft server which I had to use a chmod a+x (file location). Which I thought gave it the commands. Didn't work anyway, but whilst in the middle of doing that I realised all these other issues.

Info:
MacBook Pro (13-inch Late 2011), Mac OS X (10.7.3)