I don't advise this nor have I done it (I have to the same chipset), but I've seen people post success with it. Back up any important data you don't want to lose
before you shut the system down the last time.. remove the the system devices in Device Manager. Then see how Windows 9X handles that on the new board. It'll probably refind the I/0 devices as well because IRQs will probably change, unless you manually are able to set in the bios of the KT7 IRQs for the devices in their current config. If it looks ok you can load the mb drivers. Worst thing that can happen... you have to format and reinstall the OS.