Web Talk

Another big issue users are experiencing after updating their computers with the brand new Windows Vista Service Pack 1 is the USB system not working anymore. This issue involves every USB related device such as: mice, USB dongles, keyboards, external or portable hard disks etc. The USB device is simply not recognized or not detected and the computer returns this message: “Unknown Device”. Microsoft acknowledges this issue even after installing KB938371 and states: “We are aware of concerns that a recent Microsoft update may be causing problems with USB devices. We are investigating the matter, and at this time, do not have any information to share”. Anyway on TechNet forum a guy posted the fix. Here is the trick:

1. Go to Control Panel –System and Maintenance — System — Device Manager.
2. In the Device Manager, expand the tree of Human Interface Devices.
3. Update the driver for all Unknown Device.
4. Of course Windows Vista won’t find any new device. When prompted select Browse my computer for driver software.
5. Enter or browse to C:\Windows\winsxs as the driver location and press the Next button.
6. If the system warns you about unsigned driver, just go on.
7. At this point windows Vista should install the right driver for your device.
8. Done!

Source: TechNet forum