VKD Error Message on Startup

Just recently received a VKD Error Message on a desktop workstation and a laptop. Have previously seen a VXD Error Message but have never encountered a VKD Error Message. What is the problem and is there a fix without having to format and reinstall Windows 98.

I seemed to fix the first problem with the desktop by rebooting the system several times until it worked but the laptop is still giving me the same error message.