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.
Code:
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 0000001e@2015/2/13:22:54:06.780 (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
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