Some sites believe that security is enhanced and important information preserved intact (security event logs), 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 options are set by the following Windows NT / Windows 2000 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.

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.