How do I log in as the administrator?

[bigbluf]

Any help would be appreciated! I've never worked with Vista before and as a new help desk tech I need to be able to log into users PC as the admin and cannot figure out how! The client is another PC on my domain. I don't believe I have remote access at this time. I could do it on XP and am lost here. I have my user/password so thats not the problem (dumb, not that dumb). I just don't want to get in trouble on my first day

 

[hakon]

To log in as the administrator, you must enable the account.

to do that type this in a command prompt

net user Administrator /active:yes

after that you can go to the login screen and log into the administrator account

EDIT: If you forgot the administrator password you can set a new one by typing

net user Administrator *

in the command prompt.
NOTE: this only works if your account is a member of the administrator group (has admin privileges)