Just thought I'd post an update, I tried to reset my cmos - first time I did this the previous usb hubs that weren't working started to work, however the front usb 3.0 port on my case stopped working as did 2 on the back of the mother board, my keyboard would light up but not install any software so couldn't be used
Tried to res set the cmos again - this time it went back to the original problem I posted in my first post
- both ocassions with nothing plugged in I would receive an unknown device in device manager under the usb section
I got fed up (not going to lie) so I uninstalled all the drivers for 3.0 devices in device manager and reset the pc, it re installed the drivers but my keyboard still wouldn't install and my 4 usb ports wouldnt work, so I just turned the pc off (powered down and at the wall)
came back their now after about an hour to have another go - booted up and installed the drivers for remaining 3.0 ports and my keyboard effortlessly - I dont know exactly what solved the problem - because ive powered the pc down and turned it off at the wall over the weekend a few times, so maybe it was a combination of uninstalling the drivers and letting the pc sit without even standby power - I;m not sure but hopefully this wont happen again, and for anyone suffering the same problem as myself perhaps try to uninstall the drivers and power down? good luck.
i7-2700K @ 1.33v 4.6ghz/ Asus Maximus Extreme IV-Z
Nzxt Phantom + Nzxt Havik 140
His IceQ7950 3G/Corsair VX550
Finally Updated to Windows 7! :cool: