workstation go into"locked workstation "mode

DELL new system , windows 2000 professional SP4, for some reason the computer
after a few hours not exacly how long , goes to " this computer is in use and
has been locked" only administrator can unlock the computer , now i have gone
and disable all setting on windows .
*power management 'NONE"
*Screen saver "NONE"
i had to go to registry and disable the screen saver setting and still comes
and locked the computer , the problems is we connect sometimes usiong
GOTOMYPC , and if the computer is locked then we can not used it .

help please i do not know what else to tried on this computer, by the way
this is computer on a domain windows 2000 server , i chech and there is not
setting that will couse this , plus this is the only computer is acting this
way.

thanks for any help.l

 

The locked workstation is the result of someone doing the Ctrl+Alt+Del then clicking on the lock workstation. If you have the Admin username and password there souldn't be much of a problem. A locked workstation is nothing major, all services/programs that are running stay running.