Hi danperk - yeah that's the new-ish UAC system in Windows that kind of locks down the machine in certain ways.

One of the things that it does is prevent modifications to stuff inside the \Program Files folder.

If you can get a Admin command window up as Steve describes above, that will probably enable it to work.

Another way is if you temporarily disable the UAC system - to find the setting for that type in "User Account Control" into the search box, that should get you to the control for it.

- Michael