Must I reinstall Win 98 to get an accurate hardware listing for my new motherboard?
You do need to tell Windows to go out and find all the hardware all over again, but you don't necessarily need to reinstall Windows to do so.
An important first step will make the change easier if you're going to switch your graphics adapter at the same time: Be sure to change your graphics adapter driver to Standard VGA before you shut down the old motherboard for the last time. This will save you grief from the computer trying to use the wrong driver for the new PC Card when you start up.
Before you shut down the old motherboard for the last time, go into your Registry and delete HKEY_LOCAL_MACHINE\Enum and everything under it. Then install the new motherboard and power up. Plug and Play will go out and look for all the hardware and will leave your system properly configured for the new motherboard.
(taken from PC Magazine 9/20/2000)