800F081F Error Windows update installer x64

[aff]

Hi. having problems getting windows update to work. Tried one of the msu hotfix's but it didn't help. Not really looking forward to a reinstall.

 

[NoelDP]

The CBS log is filled with error sequences like this...

Line 1490: 2015-03-28 10:45:25, Error                 CBS    Exec: Failed to pre-stage package: WUClient-SelfUpdate-Core-AdmComp~31bf3856ad364e35~amd64~pt-PT~7.6.7600.320, file: wuaueng.dll.mui, source: \\?\C:\Windows\Servicing\Packages\amd64_microsoft-windows-w..ient-core.resources_31bf3856ad364e35_7.6.7600.256_zh-cn_8aefebe76d4c7c4f\wuaueng.dll.mui, sandbox: (null) [HRESULT = 0x800f081f - CBS_E_SOURCE_MISSING]
	Line 1494: 2015-03-28 10:45:25, Error                 CBS    Failed to pre- stage package: WUClient-SelfUpdate-Core-TopLevel~31bf3856ad364e35~amd64~~7.6.7600.320 [HRESULT = 0x800f081f - CBS_E_SOURCE_MISSING]
	Line 1497: 2015-03-28 10:45:25, Error                 CBS    Failed to process single phase execution. [HRESULT = 0x800f081f - CBS_E_SOURCE_MISSING]

Unfortunately, this type of error has proved almost impossible to solve in the past - by far the quickest solution is a repair install or the OS, if you have the proper media available.
See the tutorial here.
http://www.sevenforums.com/tutorials/3413-repair-install.html?ltr=R