A device driver is not installed or a hardware device does not function correctly after you install a Windows Vista Service Pack

After you install a Windows Vista Service Pack on a computer that is running Windows Vista, a hardware device does not work correctly. Additionally, if you open Device Manager, you might see an exclamation point next to the name of the hardware device.

The device driver might not be installed or it might not be installed correctly. Follow these steps to determine whether Device Manager can find the device and to install or reinstall the device driver as necessary:

Step 1: Determine whether the device driver is found in Device Manager

1. Click Start
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   , type Device Manager in the Start Search box, and then press ENTER.
2. Click Continue. The Device Manager dialog box is displayed.
   
   
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   If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.
3. In the list of device types, click the type of device, and then locate the specific device that is not functioning.
   • If an exclamation point appears next to the name of the device that is not functioning, Device Manager cannot find the device driver. Go to step 3, "Use Windows Update to find a device driver."
   • If no exclamation point appears next to the name of the device that is not functioning correctly, go to step 2, "Uninstall and reinstall the device drivers."
4. Close Device Manager.

Step 2: Uninstall and reinstall the device drivers

If no exclamation point appears next to the name of the device and the device does not function correctly, manually uninstall and reinstall the device drivers. To do this, follow these steps:

1. Click Start
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   , type Device Manager in the Start Search box, and then press ENTER.
2. Click Continue. The Device Manager dialog box is displayed.
   
   
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   If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.
3. In the list of device types, click the kind of device, and then locate the specific device that is not functioning.
4. Right-click the device, and then click Properties.
5. Click the Driver tab.
6. Click Uninstall.
7. Click OK.
8. In the Device Manager dialog box, click the Action menu, and then click Scan for hardware changes.
   • You may receive a message that states that Windows has to install driver software for your unknown device. If you receive this message, click Locate and install driver software (recommended).
   • You may also receive a message that states that a hardware device is being installed and that the uninstalled device is now present in Device Manager.
   Note If you do not receive either message or the hardware device is not installed, go to step 3, "Use Windows Update to find a device driver."

If the device is installed correctly and functions correctly, you have resolved the problem and you are finished. If the device is installed but still does not seem to be functioning correctly, go to the "Next steps" section.

Step 3: Use Windows Update to find a device driver

Note To use Windows Update, you must be logged on to the computer as an administrator. To verify that you are logged on to Windows with a user account that is a computer administrator, visit the following Microsoft Web site:Follow these steps to use Windows Update to scan for a device driver:

1. Click Start
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   , click All Programs, and then click Windows Update.
   
   
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   If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.
2. Click Check for updates.
3. To determine whether updated drivers are available, click View available updates.
   
   If updates are available, click the driver that you want to install, and then click Install.
   
   
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   If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.

If Windows Update is unable to locate the required device driver, contact the device manufacturer to download the latest device driver for Windows Vista. For information about how to do this, see the "More Information" section.

If these methods did not resolve the issue, go to the "Next steps" section.

If these steps did not resolve your issue, you may want to ask someone you know for help, or you may want to contact the device manufacturer. You can also use the Microsoft Customer Support Services Web site to find other solutions to your problem. Some services that the Microsoft Customer Support Services Web site provides include the following:

• Searchable Knowledge Base (http://support.microsoft.com/search/?adv=1) : Search technical support information and self-help tools for Microsoft products.
• Solution Centers (http://support.microsoft.com/select/?target=hub) : View product-specific frequently asked questions and support highlights.
• Microsoft Customer Support Newsgroups (http://www.microsoft.com/communities/newsgroups/default.mspx) : Contact counterparts, peers, and Microsoft Most Valuable Professionals (MVPs).
• Other Support Options (http://support.microsoft.com/default.aspx?pr=csshome) : Use the Web to ask a question, contact Microsoft Customer Support Services, or provide feedback.

If you continue to have problems after you use these Microsoft Web sites or if you cannot find a solution to the problem on the Microsoft Support Services Web site, click the following link to contact Support.

For information about how to contact hardware and software vendors, click the appropriate article number in the following list to view the article in the Microsoft Knowledge Base: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

For more information about how to troubleshoot audio problems that may occur after you install Windows Vista Service Pack 1, click the following article number to view the article in the Microsoft Knowledge Base:

For help with device problems in Windows Vista, visit the following Microsoft web page: