When you shut down Windows Server 2003, you receive a stop error from the Mrxsmb.sys driver:

STOP 0x000000CE (parameter1, 0x00000000, parameter2, 0x00000000)

Where parameter1 and parameter2 are Mrxsmb.sys addresses.

This BSOD (Blue Screen Of Death) occurs if the Mrxsmb.sys driver is unloaded before it is fully shut down.

NOTE: Microsoft is aware of this behavior.