You probably do not need to flash the BIOS.
In all liklihood, you just need to set up your video driver to support LCD. It will be slightly different for Windows 98 (sorry, I only have Windows 2000 at my disposal at the moment), but the basic procedure is as follows:
1) right-click on the desktop and select "Properties"
2) Go to the "Settings" tab and select "Advanced..."
3) Go to the CHIPS tab and make sure you have either "LCD" or "BOTH" (I recommend "BOTH", at least to get everything up and running) selected.
4) Select "OK" and you should be able to see an output on the LCD screen of your 1025
Trey Hamilton
National Instruments
Applications Engineer
http://www.ni.com/support