Hi Ian,
I appreciate the efforts which you have put to try and fix the issue till now.
1) Is this issue specific to Rocksmith USB Guitar? Are you able to use other USB devices on the computer?
2) Are you using Windows 8.1 Preview on Windows 8.1?
As per the information regarding the Direct-X End User Runtime Installer is concerned, Windows 8.1 has the latest Direct-X 11.2 as the default version. Refer to the link to get the details:
Refer to the section "For more information":
http://support.microsoft.com/kb/179113/en-us
Code 10 error code for a specific device under Device, in spite of reinstalling or updating drivers, might occur device configuration issues. The Code 10 error is mainly related to hardware and device driver issues or to
compatibility issues between hardware drivers and additional software that is installed in Windows.
As far as compatibility of the device is concerned, it is not compatible with Windows 8.1. Refer to the link to get the details on Windows Compatibility center:
http://www.microsoft.com/en-in/windows/compatibility/CompatCenter/ProductDetailsViewer?Name=Rocksmith%20Learn%20To%20Play%20Guitar%20And%20Bass&vendor=Ubisoft&Locale=1033%2C2057%2C3081%2C4105%2C16393&BreadCrumbPath=Rocksmith%20guitar&LastSearchTerm=Rocksmith%2Bguitar&Type=Software&tempOsid=Windows%208.1
It solely depends on the device manufacturer in such cases when the device is not compatible with the operating system. However, you can follow the steps mentioned in the link and check if resetting the corrupt registry
entries for the device fixes the issue.
Refer to the section “Common resolutions for Code 10 error” and then “Troubleshooting methods for Code 10 error”
http://support.microsoft.com/kb/943104/en-us
Note: This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow
these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, you can refer to the following steps to back
the registry files on the computer:
a) Press Windows and R key to open the run box.
b) Type ‘regedit’ and press Enter from the keyboard.
c) Open the
file option on the menu bar.
d) Click on
Export and save the file with a name on the desktop.
If you want to restore the file, you can do so by double clicking the file that you have saved on the desktop.
Please let us know about the results. We will be glad to assist you further.