Need help with USB ports not working. Please help

Hi, my USB has suddenly stopped functioning. There is a total of 6 USB ports and only two are currently working. In Device manager there is a yellow exclamation next to "unknown device". Can someone please give me possible solutions to fixing this problem?
I have so far restarted my computer, updated all windows updates and unplugged and plugged all device and no luck.
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    Try going to the device manager and rolling back the drivers. If that fails then go to the motherboard's or PC's (if it's store bought) manufactures website and download the driver. Make sure to completely remove the old driver before installing the downloaded driver.
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