I was having stability issues with my SE440BX-2 motherboard with a Geforce2 MX/400 graphics card running Windows 98SE. Simple things like right clicking on a folder in Windows Explorer could crash the system. After much trouble shooting, I finally traced it down to the NVidia graphics driver. I was using version 81.98, the last released version for Windows 9x. I started trying older versions and things got better, but I was still having issues. I finally ended up using version 45.23 and things are now totally stable. If you are running into similar issues, I strongly suggest trying an older version. Odds are that will help.