I have been trying for some time to install update KB300850 on a Dell Venue Pro 11 tablet and when I do so it fails during the "configuring windows.." stage and reverts the update back.

I tried a system restore to factory settings and then installed KB300850 before any other update. This exhibited the same behaviour.

I then performed another factory reset and installed all other updates and then installed KB300850 and recevied the same issue.

I have tried running the following:

1. sfc /scannow
2. DISM.exe /Online /Cleanup-image /Restorehealth
3. The "Automatically diagnose and fix common problems with Windows Update" FixIT program.

None of these options have resolved the issue. When I run the update, either through windows update or via a downloaded installer it reaches 99% then states "Failure configuring windows updates undoing changes".

I did read another thread which talked about a Kodak printer causing the install to fail, however, this system has no printers installed and has been factory reset so there is no other non-Microsoft / Dell software on the tablet. 

There is nothing labelled "error" in the cbs log and the update log reports "Failure content Install Installation Failure: windows failed to install the following update with error 0x800f0922: Update for windows 8.1 (KB300850). I have tried to install KB2975061 but it states that this update is already installed.

Does anyone know how I can resolve this issue?

How do I reset Windows Update components?

http://support.microsoft.com/kb/971058

I know you have already tried the above but once again try to run and check the reports.

After that, lets start windows in clean boot mode and try to update again:

How to perform a clean boot to troubleshoot a problem in Windows 8, Windows 7, or Windows Vista

http://support.microsoft.com/kb/929135