Local Account Lockout Problems

HELP!!!!
I need some help please.

There was an issue that locked out all local accounts on all of the desktop computers across my location (around 2000).

I need to find a way to unlock all local accounts without actually connecting via Computer Management and unlocking each individual one.

Does anyone out there know any scripts or has anyone heard anything that would be able to assist me in this task?

All machines are running XP and I do have domain admin rights.

All help would be greately appreciated.

Thanks in advance.