Windows scan impossible

Bonjour,

Je viens de supprimer un 0access de mon ordinateur, mais mon pare-feu Windows ainsi que mon Windows Update ne veulent pas se lancer ("Le centre de maintenance n'a pas pu activer/changer...)"
Du coup je fais un sfc /scannow en administrateur sur cmd, mais j'ai une erreur à 16% de la recherche. Voici les erreurs dans le log:
2013-05-15 23:41:26, Error CSI 000000af (F) STATUS_OBJECT_NAME_NOT_FOUND #1557912# from Windows::Rtl::SystemImplementation::CBufferedRegistryProvider::SysQueryValueKey(flags = 0, key = 2583a0 (error querying object name; ntstatus: STATUS_INVALID_HANDLE), vn = [ml:30{15},l:28{14}]"CommonFilesDir", kvic = 2, kvi = 2, disp = 2)[gle=0xd0000034]
2013-05-15 23:41:26, Error CSI 000000b0@2013/5/15:21:41:26.265 (F) d:\win7sp1_gdr\base\wcp\sil\reg_buffered.cpp(854): Error STATUS_OBJECT_NAME_NOT_FOUND originated in function Windows::Rtl::SystemImplementation::CBufferedRegistryProvider::SysQueryValueKey expression: (null)
[gle=0x80004005]
2013-05-15 23:41:27, Error CSI 000000b1 (F) STATUS_OBJECT_NAME_NOT_FOUND #1557908# from Windows::Rtl::SystemImplementation::DirectUserProvider::GetSpecialDirectoryPathFromHKLM(...)[gle=0xd0000034]
2013-05-15 23:41:27, Error CSI 000000b2 (F) STATUS_OBJECT_NAME_NOT_FOUND #1557907# from Windows::Rtl::SystemImplementation::DirectUserProvider::LookupSpecialPath(...)[gle=0xd0000034]
2013-05-15 23:41:27, Error CSI 000000b3 (F) STATUS_OBJECT_NAME_NOT_FOUND #1557906# from Windows::Rtl::SystemImplementation::CUserProfile::GetSpecialDirectoryPath(f = 0, did = 43 (0x0000002b))[gle=0xd0000034]
2013-05-15 23:41:27, Error CSI 000000b4 (F) STATUS_OBJECT_NAME_NOT_FOUND #1557905# from Windows::Rtl::SystemImplementation::CUserProfile_IRtlUserProfileTearoff::GetSpecialDirectoryPath(...)[gle=0xd0000034]
2013-05-15 23:41:27, Error CSI 000000b5 (F) STATUS_OBJECT_NAME_NOT_FOUND #1557904# from ComponentStoreImpl::LookupStringReplacement(...)[gle=0xd0000034]
2013-05-15 23:41:27, Error CSI 000000b6 (F) STATUS_OBJECT_NAME_NOT_FOUND #1557900# from ComponentStoreImpl::LookupStringReplacement(...)[gle=0xd0000034]
2013-05-15 23:41:27, Error CSI 000000b7 (F) STATUS_OBJECT_NAME_NOT_FOUND #1557899# from CFileInstaller::MapVariable(pvContext = @0xf8d1a8, var = [ml:102{51},l:38{19}]"runtime.commonFiles", val = [l:0]"")[gle=0xd0000034]
2013-05-15 23:41:27, Error CSI 000000b8 (F) STATUS_OBJECT_NAME_NOT_FOUND #1557587# from CFileInstaller::DoComponentOperation(...)[gle=0xd0000034]
2013-05-15 23:41:27, Error CSI 000000b9 (F) STATUS_OBJECT_NAME_NOT_FOUND #1557586# from PrimitiveInstaller::CCoordinator::RepairComponent(Component = Microsoft-Windows-Foundation-Default-Security.Resources, Version = 6.1.7600.16385, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture = [l:10{5}]"fr-FR", VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral)[gle=0xd0000034]

Que faire merci d'avance.