Meh, honestly if you aren't using the same computer all the time (i.e. laptops) then just net send a billion times and then log off and leave. I did it and the admins were just like wtf?
To be honest, find a file explorer on the net, open it, and explore aroudn on the drives. Or go get a version of linux that fits on a floppy and boot from that
. I
have seen utilites on the net that will remove or bypass the user restricitions, but I am not going to supply you with links.