well to get the password changed on a school comp or limited(if u dont know the network name)

just open a word file and type
@echo off
net users

save is as a BAT file and open it
cmd will pop up and close real fast so be ready w/ "prt scr" and the paste is in pan and get the name then
make another BAT file w/

@echo off
net users (network name) *

save is as .BAT an open it and type in your new password