Actually, I believe not having proper USB 3.0 drivers for Windows 10 is the issue.
Yes, I right clicked on Unknown device and tried to update the drivers but Windows says that it cannot find suitable drivers.
As per the link (https://www.kapilarya.com/fix-usb-ports-not-working-in-windows-10), I think I need to install first the "Intel USB 3.0 eXtensible host controller -1.0" ( marked yellow in the picture) from microsoft with respect to my Intel 6 series C200 chipset.
As mentioned earlier, Intel told me to check with Microsoft! Please let me know from where I can get this driver.