Autodetect not happening

I just put 2000 on a second drive on my PC, dual booting
with 98. It seems to have installed OK, but does not detect my modem or network card.  These both work in 98.
I downloaded the 2000 driver and installed it, but I get a hardware error when  I try to connect.  When I look at all of the devices in System, a number of them are yellow including the modem, so I am guessing that they don't work either.

Why might 2000 not detect the devices or allow me to install the drivers manually so that the devices work

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I'm not sure if microsoft still has it on its website BUT try there and see if the windows 2000 check program is available.Run it on the Win98 drive and it will tell you what hardware is supported or needs update drivers. Some older hardware is just not supported by 2000. Oh browse your WIN2000 CD the check program may be on it.
> Why might 2000 not detect the devices or allow me to install the drivers manually so that the devices

MS typically does not detect. But it should allow upgrade of proper Win2k drivers. Possibly you neglected to logon as administrator, which is essential for HW upgrades. Then right click the device in device manager and install drivers from floppy. (Or your favorite download directory, if you've taken good notes)

You might want to review ReadMe of Mfr of driver. Sometime they want you to manually copy the driver update to the proper Windows directory before performing the upgrade.

For internal PCI cards, you may need to move them to other than slot one
The other thing to check is as if the modem (internal in most case) and network card are plug-n-play.  Sometime plug-n-play is no working so good.  You may need to assign I/O address and IRQ manually.  
As good start is take down the I/O address and IRQ assignment after you booted into Windows 98 (I think they have no problem in Win98, right?).  Then, compare them with the setting in W2K.
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