Sometimes when you met weird hardware issues, you may need to uninstall old drivers to do troubleshooting.Below steps will show you how to uninstall drivers in windows 7.
1.Open an Elevated Command Prompt (Go to Start — All Programs – Accessories, then right click Command Prompt and click on Run as administrator)
2.Run the below 2 command to launch Device Manager
3.Click View and select Show hidden devices
4.Then find the driver you want to uninstall,right-click it and click Uninstall