A Microsoft Windows 98 CD which is now from 4 to 6 years old will not have DRIVERS for much hardware today. I hope you understand what this means.
As to the USB MOUSE and KEYBOARD, some but not all BIOS have an option to support USB keyboard/mouse in a legacy mode. I'd had to set this in either mode so its apparent there is no standard here, but it's a setting you need to tweak.
Wireless keyboard/mouse combo using USB connector still uses the mouse port, and it seems to work in this configuration, but both ports will not work with direct connected mouse and keyboard. If I boot using direct connection I get message saying I can connect mouse, but mouse isn't recognized. Any other ideas?
Also, video adaptor uses Cyrix drivers which are apparently proprietary since they are not on the WIN98 CD which I installed from. I have another computer which uses the Cyrix drivers and they are loaded on the hard drive. Can I copy them and install on the malfunctioning machine? If so, how do I identify?