I reccomend installing 98 rather than ME
with an OS lower than XP you will need to reinstall the drivers, when installed, right click on My Computer, click on Properties, go to Hardware, then Device Manager. you will see a list of all the hardware currently on it, and you will need to download drivers, and one by one update the drivers. you might have to put them on disk and take them to the computer that needs the driver updates.
to update, in device manager, right click on whatever hardware you need to update, go to Update Driver, go through and say "no I will choose the driver to install" and then click on "have disk"
from there browse to the drivers, (usually A: is your floppy drive) open them and install.