<< Ya know, you could try something EASY
see you click on the "start" button in the lower left of your screen... its probably green.
then go up to "help and support", click here now
then in the screen that opens up, click on the button that says "index" up top
now type "computer name" into the blank provided
Now look at the results. You'd want the one that says 'Rename a computer"
the instructions it provides are VERY simple and explicit.
or, in other words, RTFM >>
Heh, I got another one. DBAFA. Don't Be A Fvcking Ass.