Now I guess it worked..
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Checking System Update Readiness.
Binary Version 6.1.7601.22471
Package Version 22.0
2014-01-31 21:45
Checking Windows Servicing Packages
Checking Package Manifests and Catalogs
(f) CBS MUM Corrupt 0x800F0900...
Hello,
Well, something seems wrong.. I'm trying to use the SURT again but it says "The following updates were not installed: Hotfix for Windows (KB947821)".