We are experiencing automatic reboots that give us
dumps during the startup of Windows 200 Pro Service Pack 4.
The dump event log gives the following info.: The computer
has rebooted from a bugcheck. The bugcheck was - 0x0000007f
(0x00000008, 0x00000000, 0x00000000, 0x00000000). Microsoft
Windows 2000 [v15.2195]. A dump was saved in
C:\WINNT\Minidump\Mini*.dmp.
There are several files in the directory, due to
multiple reboots... Who can I contact about this ?

http://support.microsoft.com/?kbid=822789
You Receive a "Stop 0x0000007F" Error Message or Your Computer Unexpectedly
Restarts