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My friend's Windows 7 x64 ultimate machine recognizes some USB flash drives but not some other ones. The types of all are USB2 and also all drivers are installed (device manager). I don't know what is the problem. I also have done the works of here: http://www.techspot.com/community/topics/my-machine-doesnt-recognize-some-usb-flash-drives.202702/#post-1404832

And this is an image from that flash drive (silicon-Power 4g). Any idea how to solve he problem please?

enter image description here

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  • Will this problem be solved if I re-install the Windows, this time Win 7 x86?
    – abbasi
    May 25, 2014 at 8:48
  • What's the error displayed in the device properties?
    – and31415
    May 25, 2014 at 9:08
  • This is the message: The drivers for this device are not installed. (Code 28). Access is denied.
    – abbasi
    May 25, 2014 at 12:09

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