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What should I do with the usb device that win7 does not recognize?

  

The specific solution is as follows:
First step, right click "& computer", select "ld" in the list that appears on the right, "Manage",
Step 2, click to open the computer management Under the "Device Manager";
third step, in the "Device Manager", click "Universal Serial Bus Control", in the "USB Root Hub" device list appears below , right click on "USB Root Hub" and turn it "disabled" menu and then "Enable" ";

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