In Windows 10 or Windows 8, USB 3.0 driver is pre install where as in Windows 7 you have to install USB 3.0 controller driver manually. That is the reason your 3.0 USB port which are blue in color, in some cases (SS) super speed is mentioned on each USB port will not work in Windows 7 unless you install its 3.0 controller driver. Hope it helps.
Some of my USB ports are not working in Windows 7
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