I have a Samsung NP900X4C-A05AU 15" Ultrabook.
It came with Windows 8 installed, but I have overwritten the OS with an existing Windows 7 64-bit installation from a desktop PC.
I downloaded the Windows 7 64-bit drivers from here
All the drivers installed OK, except for the USB 3.0 driver (v. 126.96.36.199).
My 2 USB 3.0 ports are not working at all under Windows 7 (the hardware is OK, as they worked OK when I used various Live CDs to copy the C:partition).
Every attempt to install the driver from setup.exe finished without any "finished" message.
I also installed Samsung Easy Software Manager - this reports that the USB 3.0 driver needs updating - then attempts to install v. 188.8.131.52 - but it reports that it failed.
I have attached a screendump from Device Manager.
The entry "Renesas Electronics USB 3.0 Host Controller" appeared after I did a manual install from a v. 184.108.40.206 subfolder ("USB30Drv\Files\x64).
I attempted to to get Windows to automatically find a driver for "Other Device | Unknown device" - but that failed too.
The webpage for the USB 3.0 driver (v. 220.127.116.11) has a popup note that may be relevant:
This is USB 3.0 driver. Please update after removing all devices from usb 3.0 port. If not, the problem may be occurred to USB 3.0 devices or USB 3.0 port. Please referece the below install steps. 1. Click the attached file and press ''Save'' button. Then press ''Browse...'' button and select the place where you want to save the selected file. 2. After downloading the file, find the downloaded file and right_click on the file. On pop_up menu, select ''Extract All...'' option. 3. On ''Extraction Wizard'', press ''Next'' button and press ''Browse...'' button. Select a folder to extract file and press ''Next'' again. 4. After the file has been sucessfully extracted, see the extracted files. Run ''Setup.exe'' file or ''setup.exe'' file in the folder. -This driver may not be appropriate depending on the computer model. Thanks.