Some sites believe that security is enhanced and important information preserved, if systems are not allowed to restart automatically after a failure or lockup. If you have adequate operations staff to support the option or overriding security issues, the option is controlled by the following Windows NT registry hack:

Hive: HKEY_LOCAL_MACHINE
Key: \SYSTEM\CurrentControlSet\Control
Name: CrashControl
Type: REG_DWORD
Value: 0 Disable automatic reboot
Value: 1 Enable automatic reboot

Related: Q174630 - Windows NT Restarts Continuously with Blue Screen.

A common Blue Screen of Death, BSOD, is STOP 0x0000007F (UNEXPECTED_KERNEL_MODE_TRAP). This stop error is caused by hardware problems. The common causes are overclocking the processor, mismatched memory modules, a bad RAM module, and a motherboard problem. If you attempted to boost processor speed using overclocking, be aware that the heat generated tends to damage the motherboard. If you haven't been experimenting with overclocking, open your box and reseat everthing: RAM modules, cards, cables, ... If the stop error still occurs, swap out your RAM. If you eliminate RAM as the cause, then you probably have a motherboard problem.

Consider Blue Screen Administration for Windows NT and 2000
offers you the chance to administer your Windows NT and Windows 2000 after a Blue Screen and fix boot errors or save data from defunct volumes. You can boot NT/2000 from disk and so gain access to systems whose passwords have been forgotten.