Hi all, USB 3.0 eXtensible Host Controller Drivers included in Windows 8.1 not working correctly. I bought SP3 for car diagnostic, everything i need is only working USB port. My diagnostic adapter(MongoosePro JLR) is working in every system(include Vmware, Virtualbox virtualizations) and via any USB port (USB 2.0 or 3.0). I have a pc with same USB controller. This USB controller in Windows 7 is using Intel drivers and with this drivers i don't have a any problems with my adapter. Dear Microsoft, after some hacks i installed Windows 7 drivers for this controller (Edited *.inf files, removed signatures, disabled driver signature verification in windows 8.1) . Drivers installed and working perfectly. And with this drivers my adapter is working too. This issue is driver side issue otherwise USB controller or diagnostic adapter doesn't work with Win7 drivers. Or sign and release Intel drivers ))) Sorry for my English, Thank You.