dumping physical memory to disk

sir!
i installed new windows2000 server for first domain controller with service pak 4 and
had create active directory but when i connect my LAN then after some minuts blue screen appear and message "Driver Irq_no_less_equal address F5B49B7E
base at F5B1C000 Datastamp 3ea39ad1 tcpip.sys
begnning dump of physical memory
dumping physical memory to disk"

sir please solve this problem whats the reason of this problem
i will very thankfull to you and i m waiting of your anserw.
thankyou