Why don't I have the right to create a text file in my root directory?

When I right-click in a window showing my C:\ directory in Windows 7 and try to create a new text file, I get an error message: "A required privilege is not held by the client." Why is this and how can I change it?

The C: drive is protected from modification by normal users. Unless your an administrator or can elevate another process to administrator, you won't be able to write to C: drive except in your C:/Users/ folder.

More Info

IF you right click C: in the Computer view, go to security, you'll notice that you won't have Write permissions. You get Read/Execute, List Files, and Read.