DRIVER_POWER_STATE_FAILURE in Windows 2000 Problem.

Hello All,
We have a Encryption/Decryption Upper class Filter Driver which works well
for Windows 2000 and Windows XP.
But Sometimes in Windows 2000 during shutdown it causes
DRIVER_POWER_STATE_FAILURE Bugcheck. This happens only in "some" windows
2000
systems.
In the same system some times during Shutdown the screen goes blank with a
blinking cursor at the top.
All these problems occur only in Windows 2000 and NOT on Windows XP.
Is there a specific reason for the same?
I know its a power tranisition problem But how to proceed after that.

Thanks Very much.
Regards
Shal.