What I do in such circumstances is run a little piece of freeware called "Unknown Device Identifier" which does a pretty good job of telling me what device is not working properly, identifying the manufacturer, which allows me to look up the support site and get the driver necessary to correct the problem. I've found that to be the quickest and surest way to resolve such issues.
You can also try double clicking the device in device manager and then selecting "update driver" and see if Windows can locate it on your hard drive or search the internet [providing you have a working connection] to find the appropriate driver and install it. I find it works about half of the time.
There is are other trouble shooting methods and the Microsoft Knowledge base does the most straight forward job of defining them so rather than reinvent the wheel I'll present them as written there:
The main reason for Unknown Device to
display in your Device Manager is because you have a device that is not
working correctly. To fix this issue, obtain an updated driver for the
device.
Use the following methods to enable Windows to recognize your device.
Method 1: Windows Update
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Visit the following Microsoft Web site to see whether the Web site
autodetects an updated driver for your device. Install all recommended
drivers.
http://www.windowsupdate.com
(http://www.windowsupdate.com)
Method 2: Download and install the latest driver from the Internet
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When
you download a driver from the Internet, download the Windows XP
version of the driver when multiple Windows versions are listed.
Use one of the following options:
Look for a Drivers section or a Download
section on the manufacturer’s Web site, and search for the device name.
Download and install the Windows XP version of the driver.
Advanced user section
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This section is intended for advanced computer users. If you are not
comfortable with advanced troubleshooting, you might want to ask
someone for help or contact support. For information about how to do
this, visit the following Microsoft Web site:
http://support.microsoft.com/contactus
(http://support.microsoft.com/contactus)
Causes of unknown devices in Device Manager
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Note
Most USB and IEEE 1394 devices function correctly without additional
device drivers because they are configured by the drivers that are
included with Windows for these bus types. However, an additional
device driver is needed if the device does not fit the defined and
supplied Windows class drivers. If the bus cannot identify the device,
it interprets the device as a composite device and then reports it as
such in Device Manager.
Note
Software programs that require virtual hooks into hardware may create
these devices. Additionally, devices that bridge between bus types,
such as a device driver that enables a parallel port device to emulate
a SCSI or an AT Attachment Packet Interface (ATAPI) bus, are also known
to generate an unknown-device response in Device Manager.
A spyware infection doesn't care if your system is running Vista, XP, or Windows 98. With over 20 years of experience cleaning up computers, I can tell you that every system is at risk, and every operating system must have a robust spyware scanner that runs at regular intervals and that protects while a user browses the internet.
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