Trying to root nexus

[azules9780]

And I can't get the command prompt screen to come up by doing what they say. WHat am I doing wrong?

 

[azules9780]

Please help

Ok, so I got the command prompt to come up. When I type in cd root on the command line, it says " the system cannot find the path specified". I have made sure that I don't have any random file extensions hiding, and the file is in C: so what's wrong?