Open the Services MMC Snapin (services.msc) and look for a service called Windows Modules Installer and make sure the service is started.
If you use a 64Bit Windows, make sure you run the 64Bit cmd.exe and not the 32Bit one.
The reason why DISM can fix it, because Microsoft still doesn't provide the RTM files to download:
2014-01-03 20:45:31, Info CSI 00000800 [SR] Cannot repair member file [l:36{18}]"Amd64\CNBJ2530.DPB" of prncacla.inf, Version = 6.3.9600.16384, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type = [l:24{12}]"driverUpdate", TypeName neutral, PublicKey neutral in the store, hash mismatch
2014-01-03 20:45:31, Info CSI 00000802 [SR] Cannot repair member file [l:36{18}]"Amd64\CNBJ2530.DPB" of prncacla.inf, Version = 6.3.9600.16384, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type = [l:24{12}]"driverUpdate", TypeName neutral, PublicKey neutral in the store, hash mismatch
2014-01-03 20:45:31, Info CSI 00000803 [SR] This component was referenced by [l:186{93}]"Microsoft-Windows-Printer-Drivers-Package~31bf3856ad364e35~amd64~~6.3.9600.16384.INF_prncacla"
You need to point to the WIM file of the Windows 8.1 RTM DVD to get the correct files:
Dism /Online /Cleanup-Image /RestoreHealth /source:wim:D:\sources\install.wim:1 /limitaccess
(where D: is your Windows DVD drive or mounted Win8.1 ISO
Best Answer
The following two commands will allow write access to the Servicing folder:
Once that is done TrustedInstaller.exe can be copied from another Windows 7 x64 system, and the Trusted Installer service started.