You can find the command prompt by:
Go to start and within start search type command prompt and it will bring it up on the left side.
You can also press the windows key and "R" to bring up the run dialog box. then within there you can type cmd
. then hit enter and it will bring it up.
Also with Windows 7 when trying to do certain
things it may not allow you to without opening the command prompt as an administrator.
You can open command prompt and run as administrator by going to start and within start search type command prompt then right click on it in the search area and select to run as administrator
Desktop repair and support