Method 1: The computer is connected to the Internet
View the "Troubleshoot driver problems" topic on the following Windows Vista Help and Support Web site:
http://windowshelp.microsoft.com/Windows/en-US/Help/a8e04b78-0f18-47f0-99e7-6de781fe5f351033.mspx (http://windowshelp.microsoft.com/Windows/en-US/Help/a8e04b78-0f18-47f0-99e7-6de781fe5f351033.mspx)

Method 2: The computer is not connected to the Internet
View the "Troubleshoot driver problems" topic in Windows Help and Support in Windows Vista. To do this, follow these steps:1. Click Start, and then click Help and Support. 
2. In the Search Help box, type troubleshoot drivers, and then click the Search Help button.

Note The Search Help button appears as a magnifying glass icon.
3. In the list of topics that are returned, click Troubleshoot driver problems.
4. Click the link that best describes the problem that you experience. For example, click I just installed a new hardware device, and it is not working correctly. 
5. Follow the steps in the Windows Help and Support topic to help troubleshoot the problem.