I'll bet, you have not yet installed "Take Ownership" or "Grant Admin Full Control" yet, have you?
That should be the first thing you do on a new install of any OS from Windows Vista onward.
I only use "Grant Admin Full Control" (easily downloaded from the internet). I call it, "Take Ownership" on Steroids!
Once it installs itself in your Right Click Context Menu, then you can Right Click on the "Program Files" folder and take ownership of it.
Then you can add or delete files from it, as you wish.
There are many such Folders in my own PC, that I've taken full control of, so I can do what I wish with those files.
Documents and Settings is another folder you will not be able to access, till you take ownership of it.
Good Luck and Happy 2014!
TM