Windows 7 sp1 [Solved]

Windows update fails to install service Windows 7 sp1. After downloading the 900 MB of windows6.1-KB976932-X64.exe (I also downloaded Windows_Win7SP1.7601.17514.101119-1850.AMD64CHK.Symbols.msi and Windows_Win7SP1.7601.17514.101119-1850.AMD64FRE.Symbols.msi, almost 300 MB each but I am still not sure about the requirement of these two), I tried to update manually. But this failed again : "L'installation n'a pas réussi", "l'assembly n'a pas pu être trouvé". "Détails" do not give a lot more info : "Erreur : ERROR_SXS_ASSEMBLY_MISSING(0x80073701)". There is a link to get more info ("Se connecter pour en savoir plus sur ce problème"), but this does not help me solve this problem.

Found the same problem here and here.

Looking deeper in C:\Windows\Logs\CBS\CBS.log (>250 MB) :

2011-03-12 22:11:26, Info                  CBS    Exec: Resolving Package: Package_43_for_KB976098~31bf3856ad364e35~amd64~~6.1.1.1, Update: 976098-91_neutral_LDR
2011-03-12 22:11:26, Info                  CBS    Exec: Resolving Package: Package_43_for_KB976098~31bf3856ad364e35~amd64~~6.1.1.1, Update: 976098-91_neutral_LDR, PinDeployment: amd64_8c41fc7eb0dbe2daefc621237184c0e3_31bf3856ad364e35_6.1.7600.20561_none_e8d566dacff1f5ff
2011-03-12 22:11:26, Error                 CSI    0000000c@2011/3/12:21:11:26.177 (F) d:\w7rtm\base\wcp\componentstore\csd_locking.cpp(324): Error STATUS_SXS_ASSEMBLY_MISSING originated in function CCSDirectTransaction::LockComponent expression: (null)
[gle=0x80004005]
2011-03-12 22:11:37, Error                 CSI    0000000d (F) STATUS_SXS_ASSEMBLY_MISSING #1573632# from CCSDirectTransaction::OperateEnding at index 0 of 1 operations, disposition 2[gle=0xd015000c]
2011-03-12 22:11:37, Error                 CSI    0000000e (F) HRESULT_FROM_WIN32(ERROR_SXS_ASSEMBLY_MISSING) #1573517# from Windows::ServicingAPI::CCSITransaction::ICSITransaction_PinDeployment(Flags = 0, a = 8c41fc7eb0dbe2daefc621237184c0e3, Version = 6.1.7600.20561, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral, cb = (null), s = (null), rid = [77]"Package_43_for_KB976098~31bf3856ad364e35~amd64~~6.1.1.1.976098-91_neutral_LDR", rah = [1]"2", manpath = (null), catpath = (null), ed = 0, disp = 0)[gle=0x80073701]
2011-03-12 22:11:38, Info                  CBS    Failed to pin deployment while resolving Update: 976098-91_neutral_LDR from file: (null) [HRESULT = 0x80073701 - ERROR_SXS_ASSEMBLY_MISSING]
2011-03-12 22:11:38, Info                  CBS    Failed to resolve item[0] in Package: Package_43_for_KB976098~31bf3856ad364e35~amd64~~6.1.1.1, Update: 976098-91_neutral_LDR [HRESULT = 0x80073701 - ERROR_SXS_ASSEMBLY_MISSING]
2011-03-12 22:11:38, Info                  CBS    Failed to resolve execution update. [HRESULT = 0x80073701 - ERROR_SXS_ASSEMBLY_MISSING]
2011-03-12 22:11:38, Error                 CBS    Failed to resolve execution package: Package_43_for_KB976098~31bf3856ad364e35~amd64~~6.1.1.1 [HRESULT = 0x80073701 - ERROR_SXS_ASSEMBLY_MISSING]
2011-03-12 22:11:38, Info                  CSI    0000000f@2011/3/12:21:11:38.370 CSI Transaction @0x34c280 destroyed

I think the important part is Package_43_for_KB976098~31bf3856ad364e35~amd64~~6.1.1.1. So I tried to download KB976098 for x64 and install it manually, but windows tells me it is already installed.

• sfc /scannow found nothing.
• System Update Readiness Tool (KB947821 [v14]) does not help either (cannot install).

I eventually managed to install SP1 thanks to Kris post : I had to remove 4 KB : KB976098, KB979306, KB981793 and KB979916. Problem solved !