[DM-MUG] Oops... lost password

[Robert Craddick]

I have several computers in our facility and got one back with two user 
names with passwords required to allow system access:
one is a 'guest' user,  and I can access the computer with a password 
for this unit, but do not have capacity to administer the computer 
because the password is unknown. If an administrator username and 
password are not known is there a way to just reload all software and 
set the thing up again from scratch?