Server won't startup

I just shut down and restarted my server running Windows NT4.0. When it started, it came up with this message:Fatal system error 0xc00000(0x77f889b3) the window subsystem processes terminated unexpectedly. Dumping physical memory. Then it runs from 0% to 100% of the process:dumping the physical memory. After that the server restarts and the same process continues again and again without logging on to NT. Please help, this server runs our Lotus Notes (email system).