Unknown usb device error

theuniquegamer

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Sep 7, 2011
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Hello everyone i am new here. I have question to ask.
I just bought a amd phenom ii x4 955 and a asus m4a88tm le motherboard . After that i formated my hdd and installed win 7 ultimate and amd motherboard drivers. Now when i connect a usb device it shows Unknown usb device (except my mouse and keyboard) . Please help me.