Rebooting the PC while it is starting up shouldn't have that kind of
effect.

Did you reboot by pressing the Reset button?

What happens when you enter Safe mode?

I would try opening the Device Manager and removing the video card and
*all of the entries* of devices that have more than one instance
showing, so that Windows can reinstall the drivers.

If that doesn't work, I would try reinstalling Win98 to a different
folder from the Windows folder.

You have the option to choose the name of the folder to install it to
during setup.

If it works, you can recover your files if you didn't back them up.

Alternatively, a format and reinstall is probably the only way out of
that.

Eric,
PC Buyer Beware!
http://www.pcbuyerbeware.co.uk/