Be aware that this method may be time-consuming and is not always reliable. Determine whether the device driver is digitally signed When you install a device driver, and Windows detects that it is not digitally signed, you may receive a warning message and the option to cancel or continue the installation This message is displayed only if your computer is configured to display a warning message whenever an installation program tries to install a device driver without a digital signature.
Note A device driver that is digitally signed can still be listed as an unknown device in Device Manager. For more information about driver signing for Windows, visit the following Microsoft Web site:. You can block the installation of device drivers that do not contain a digital signature. Use this approach when you want to prevent any deliberate attempts to destabilize the computer.
To do this, follow these steps:. Click Start , click Run , type control sysdm. Under Drivers , click Driver Signing , and then click Block - Never install unsigned driver software. To view a list of device drivers installed on your computer that are not digitally signed, use either of the following methods:.
Error 0xef: The third-party INF does not contain digital signature information. Use the File Signature Verification tool The File Signature Verification tool lists all the unsigned drivers that are installed on your computer.
It creates a Sigverif. Use any text editor for example, Notepad to view the file. To use the File Signature Verification tool to display a list of drivers that are not digitally signed, follow these steps:. Click Start , click Run , type sigverif, and then click OK. Click Advanced , click the Search tab, and then click Look for other files that are not digitally signed.
Click to select the Include subfolders check box, and then click Browse. Review the list, and then contact the driver manufacturer for information about how to obtain an updated driver that is digitally signed.
USB devices that are based on earlier versions of the USB specification may create ghost devices that appear when the device is connected, and then disappear when the device is disconnected. Also, the device may work fine, but may create a disassociated unknown device. This is typically caused by firmware that is either outdated or configured incorrectly.
In this case, contact the device manufacturer for updated firmware. A ghosted device can appear if you manually install a driver for a Plug and Play device that the computer has already detected and installed.
You can resolve this issue by deleting the ghosted device. For more information about how to use Device Manager to manage devices in Windows XP, click the following article numbers to view the articles in the Microsoft Knowledge Base:. The third-party products that this article discusses are manufactured by companies that are independent of Microsoft.
Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products. The Bluetooth now works, but the sound is still showing as missing a driver. I have sound, I think I am not going to worry about it. One last thing though, I'm having trouble with the SD card reader. It reads one card, but not the others. It may not be a driver related issue as its reading one card. Have you tried the other cards in a different system?
I've had the cards working on this machine on both Linux and Windows 7. Just XP I'm having trouble with. Browse Community.
Laptops General - Read Only. Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for. Did you make any changes to the computer before the issue occurred? For your reference: Information about hardware device drivers for Windows XP. Was this reply helpful? Yes No. Sorry this didn't help. Thanks for your feedback.
Save my name, email, and website in this browser for the next time I comment. Code 1. There is no driver selected for the device information set or element. Close the window and go to Ethernet and uninstall the device. Comments Do manufacturers have to provide the original drivers cd as I lost it?
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