Dell M6600 Windows 10 USB xHCI driver not working.

I have been using Widows 10 for some time now on  my M6600. I can put up with some of the incompatibility but have just discovered that my USB 3.0 ports are not working. I have tried the Intel site scan and nothing I do seems to rectify the problem. It is the USN xHCI drivers that is the problem. Anyone got a fix for this?