What should i do when my window 7 not detecting usb

Hello,
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  1. akbarnagani said:
    Hello,

    Try this:

    1) Run the fix it from “Hardware devices not detected or not working”
    http://support.microsoft.com/gp/ha [...] e_problems

    2) Then refresh the USB Stack
    a. Click start-Control Panel - Device Manager –

    b. Expand USB Serial Controllers - RIGHT CLICK on EVERYTHING and UNINSTALL all except the category itself.

    c. REBOOT the computer. This refreshes the drive and the USB stack
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