Wildray, Officially you are not the administrator under W7; by default the administrator account is hidden and owned by the OS, you merely have an account with administrator privileges. The important places such a \Windows, \Program Files, & \Program Files (x86) are owned by the hidden administrator account.
This is designed to help keep you from accidentally messing up the system. It also adds one more layer of protection when the UAC makes you confirm "yes I authorize this program to change my system" prior to it actually happening.
You can set the UAC settings lower but you take away that extra level of protection.