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Windows Vista Error Fix: USB Stops Working After Installing SP1

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Another big problem that users are experiencing after updating their Windows Vista computers with the new Windows Vista Service Pack 1,especially the update KB938371 , is the USB system not working properly. This problem involves every USB related system devices such as:USB mice, USB dongles,USB keyboards,scanners,printers, external or portable hard disks etc. The USB device connected to the computer is simply not recognized or not detected and the Windows Vista computer and returns this error message: “Unknown Device”. Microsoft acknowledges this issue even after installing the update 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”.Here is the fix to enable the USB system in your Windows Vista computer:
  • Go to Windows Vista Control Panel –>System and Maintenance —> System —>Device Manager.
  • In the Device Manager window, expand the tree of Human Interface Devices.
  • Update the driver for all Unknown Device.
  • Of course Windows Vista won’t find any new device. When prompted select the option Browse my computer for driver software.
  • Enter or browse to C:\Windows\winsxs as the driver location and press the Next button to continue.
  • If the Windows Vista warns you about unsigned driver, just go on.
  • At this point windows Vista should install the right driver for your device.
  • Finished and now you will no longer get the above error message.


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