Buffalo wrote:

Then when I let Win2000 install a default VGA monitor and I used
the Monitor Attributes section (ATI Catalyst Control Center) to
uncheck 'use EDID or driver defaults' and entered the max
resolution and refresh rate, it worked.

Then in win-98, remove your monitor in device manager.

Ignore any "found new hardware" messages that might happen after that.

Your display properties should then no longer show the Envision
monitor. You should then be able to select a refresh rate like you do
in win-2K.

Does the monitor dispay the refresh rate on-screen? Are you sure that
win-2K is driving it higher than 60 hz?

You seem to be saying that the monitor has somehow "lost" it's
internal EDID information. I don't know how such a thing is possible.

But if you are able to drive it higher than 60 hz in win-2K, then
win-98 should do the same.