Model: Viper 550
Operating System: Windows 2000 (Note: might work with other versions of this os.)
Before downloading: Run Free Scan for Instant Driver Updates
Diamond Multimedia Viper 550 Driver. The Viper 550 (& 770) use the nvidia chip. Diamond lists no driver for this card for win2k. So, I used the nvidia chip drivers from their site. No problems in two weeks since I loaded the driver.