After a clean install of XP, the DVI side of my video card only works with a DVI to VGA adapter (VGA cable now has to be used on this monitor in question).
This monitor Worked fine before with a DVI cable. XP installed a Radeon 9200 series driver. I downloaded a more specific Radeon 9250 driver, but it did not help. I would just use the adapter, but the quality of this monitor is lower than that of my primary monitor.