Windows Update error 80073701 since October

[Magnus2015]

When I run Windows Update I am requested to install new Windows Update software. I press "Install now" and after a while I get an error message: "Windows couldn't search for new updates. An error occurred while checking for new updates for your computer. Error(s) found: Code 80073701".

I believe it started back in October when the Internet Explorer update to version 11 didn't work. So no updates through Windows Update have gone through since then.

I installed KB947821 manually but nothing changed.

(Windows 7 Home Premium 64 bit, Service Pack 1. Fujitsu Q510, Pentium G630T 2.30 GHz, 4 GB.)

 

[Magnus2015]

Bump! Anyone there to give a helping hand?

 

[NoelDP]

Sorry - been snowed under

The error here appears to be fairly major - and may have been made worse, if you've attempted to use any form of Registry Cleaner in an attempt to fix the problem.

2015-02-13 23:54:06, Info                  CBS    Exec: Resolving Package: WUClient-SelfUpdate-Aux-AuxComp~31bf3856ad364e35~amd64~en-US~7.6.7600.256, Update: Aux, PinDeployment: amd64_microsoft-windows-w..oyment-languagepack_31bf3856ad364e35_7.6.7600.256_en-us_7f225668bfd2dbf0
2015-02-13 23:54:06, Error                 CSI    [EMAIL="0000001e@2015/2/13:22:54:06.780"]0000001e@2015/2/13:22:54:06.780[/EMAIL] (F) d:\win7sp1_gdr\base\wcp\componentstore\csd_locking.cpp(324): Error STATUS_SXS_ASSEMBLY_MISSING originated in function CCSDirectTransaction::LockComponent expression: (null)
[gle=0x80004005]
2015-02-13 23:54:10, Error                 CSI    0000001f (F) STATUS_SXS_ASSEMBLY_MISSING #10388# from CCSDirectTransaction::OperateEnding at index 0 of 1 operations, disposition 2[gle=0xd015000c]
2015-02-13 23:54:10, Error                 CSI    00000020 (F) HRESULT_FROM_WIN32(ERROR_SXS_ASSEMBLY_MISSING) #10273# from Windows::ServicingAPI::CCSITransaction::ICSITransaction_PinDeployment(Flags = 0, a = Microsoft-Windows-WindowsUpdateClient-Aux.Deployment-LanguagePack, Version = 7.6.7600.256, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture = [l:10{5}]"en-US", VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral, cb = (null), s = (null), rid = [77]"WUClient-SelfUpdate-Aux-AuxComp~31bf3856ad364e35~amd64~en-US~7.6.7600.256.Aux", rah = [2]"32", manpath = (null), catpath = (null), ed = 0, disp = 0)[gle=0x80073701]

I'll see what I can do about it when I can clear my backlog

 

[Magnus2015]

I've tried quite a lot but not a registry cleaner as far as I can remember. Mostly Microsoft's tools and such things.

Any help at any time will be much appreciated! (I'll be away from my PC a week from Friday.)