If you have more processors than NT will recognize, try editing:

HKEY_LOCAL_MACHINE/System/CurrentControlSet/Control/Session Manager/Environment/NUMBER_OF_PROCESSORS

and:

HKEY_LOCAL_MACHINE/System/CurrentControlSet/Control/Session Manager/Environment/LicensedProcessors

Now, when you do an update install (re-install into the same directory), NT will recognize those extra processors. As with any system modification requiring use of the NT CDROM, re-apply your latest SP. Don't forget to generate a current ERD (RDISK.EXE /S).

Be sure that you are not violating any license agreements if you do this. You will require a custom HAL if your MOBO has more than 4 processors.