When it starts up and it says something about ide raid configuration or something you hit either f5 or f6. I believe it is f5. So try that first. Dont worry if you mess up just exit the installation and reboot.

BTW....
 
If you only have one processor then choose...
 
Advanced configuration and powerer interface(acpi).
 
If you have 2 processors then there is something like acpi smp or something like that. Just check all the options before you pick one.

Yes, it is F5, smacked after the detecting hardware screen goes away, hit it a few times to be sure it gets it. F6 is for adding mass storage drivers (in the case of ATA66, some SCSI, etc).
 
I think it offers ACPI uniprocessor system for one processor, and ACPI multiprocessor system (MPS) for dual. These are usually near the top of the list (scroll up with arrows)
 
------------------
-AciD
>-----------------------<
Hardware:
BP6 running QQ Beta BIOS
Dual Celeron 366 @ 566MHZ
128MB Samsung -GL
IBM UDMA66 13.6g
WDC UDMA33 5.1g
Toshiba 32x
OTI Socrates 2x2x6x
V3-2000-AGP clocked @ 166
SB AWE64 Value
Hayes V90 Int. Spk Phone
>-----------------------<
Software:
Win2K Pro Retail (2195)
Office 2000 Premium
NA ViruScan NT 4.03a
Mobo Monitor 4.10
 
[This message has been edited by acidspray (edited 16 March 2000).]

also, read the thread "Switching from UP to MP", while the topic might not seem up your alley, the procedure (judging by a quick look) would seem to work.
 
Go into device manager, expand computer, select what's there and get properties, goto driver tab, update driver button, display a list, show all hardware, assuming your hardware is compliant, there should be some ACPI driver options, pick the applicable one for your system...boom, no re-install necessary?
 
Maybe...haven't tried, just hypothesizing...
 
------------------
-AciD
>-----------------------<
Hardware:
BP6 running QQ Beta BIOS
Dual Celeron 366 @ 566MHZ
128MB Samsung -GL
IBM UDMA66 13.6g
WDC UDMA33 5.1g
Toshiba 32x
OTI Socrates 2x2x6x
V3-2000-AGP clocked @ 166
SB AWE64 Value
Hayes V90 Int. Spk Phone
>-----------------------<
Software:
Win2K Pro Retail (2195)
Office 2000 Premium
NA ViruScan NT 4.03a
Mobo Monitor 4.10

As acidspray said, you can do it through the device manager, here's how:
http://easyweb.easynet.co.uk/~stevemcd/win2000.htm