It seems like you're encountering an issue with your second video card when using two 8600GT cards in your system, and they are not configured in SLI mode. Since they were working fine on Windows XP but are causing problems now, here are some steps you can take to troubleshoot this issue: 1. Check Device Manager: - Go to Device Manager by right-clicking on the Start button and selecting "Device Manager." - Look for any warning signs (yellow triangle with an exclamation mark) next to your second video card. This indicates a driver issue. 2. Update or Reinstall Drivers: - If there are warning signs, right-click on the problematic video card and choose to update the driver software. - You can also try uninstalling the driver...