I’m really struggling to do an inplace upgrade of nt4 to windows2000 (and there *are* good reasons for doing an inplace upgrade as opposed to a clean install) and one of the suggestions to get around a bsod when it boots is to disable the cache on the motherboard. When I did that and booted into nt4, just clicking start and then run took 12 seconds to fire up the run dialog box. As you can imagine the rest of the process is painfully slow which means its going to take even longer to do the upgrade. The difference in speed when you have no cache on the processor is pretty amazing (although I guess I could have cheated by interrupting the reboot process of the upgrade to disable the cache at this point in time instead of at the beginning of the upgrade)