Machines Loosing Trust with Domain

[Guest littlsm]

Folks, we have a situation where if we run Windows 2003, Windows 2000 or

Windows XP workstations as Virtual Machines, then power them off for over 30

days the machines then become unusable.

 

What appears to be happening is that the machines are loosing their trust

with the domain that they are members of.

 

Is there any way that we can increase the time that a machine can be powered

off before it looses its trust?