When graphics drivers crash in XP, but don't cause a blue screen, windows starts a fallback driver (I think it's 640x480 in 4-bit color). When that happens, is there any way to cause the original drivers to reload without having to restart the system? (I know Win7 does it for me automatically)
I don't think so, I think this was something new added in Vista or 7.
You can try going into device manager, select your video card, then under the action menu select "scan for hardware changes". That has worked for me for other devices needing plug and play to fire off so it might work for video cards.