Messed up CMD.EXE by Taking Ownership

[spacesurfer]

Hi! I was trying to run command prompt as an administrator but the check box "Run as administrator" was greyed out. So, I took ownership of the file from "Trusted Installer" to myself. Then I modified the priviledges and messed up SYSTEM and Administrator's priviledges. I can't remember what privileges they have.

How can I restore cmd.exe the way it was? I want to restore the owner back to Trusted Installer and the priviledge for the different users the way it was.

Your help appreciated. Thanks.