Bluescreen on shutdown (NT4.0)

When I try to shut down the system it goes through saving data to disk. Then it appears to have finish when the blue screen pops up. On the top of the screen it reads
unexpected_kernel_mode_trap. I am dual-booting with Win2000. I was working on personal setting on the Win2000. Then went back to NT 4.0, did some work and when I finished I tried to shut down like I always did when the bluescreen pop up. Help?