Well my computer messed up after I installed FEAR...well...to make the story short, here is my problem...

I installed fear and after I restarted my computer, my user got all messed up. Steam was deleted along with some others things. After sometime I went and tried to re-install it. I go to the download and it says "The system administrator has set policies to prevent this installation."
How do I fix this? I don't know what to do!

Edit: It says this on all other users and no one changed those settings and it only started to happen after I installed FEAR.