Server Manager will not allow a change of roles and I see the above error logged. So far, I have have followed the threads that have worked for others with no positive result: I have run dcomcnfg.exe per: http://support.microsoft.com/kb/971509 and those settings check out OK There is no CbsUpdateState.bin in the server manager cache, so nothing to restore. The is no Symantec AV installed on this Hyper-V host. Where else should I be looking? System Update Readiness Report: No errors. Server Manager will not allow a change of roles and I see the above error logged. So far, I have have followed the following threads that have worked for others with no positive result: I have run dcomcnfg.exe per: http://support.microsoft.com/kb/971509 and those settings check out OK System Update Readiness Report: No errors. There is no CbsUpdateState.bin in the server manager cache, so nothng to restore. The is no Symantec AV installed on this Hyper-V host. Where else should I be looking?

Hi, Thank you for the post. Please perform steps below to troubleshooting: 1. Verify the "Windows Modules Installer" service is started. 2. Run "sfc /scannow" to scan all system files 3. Post the C:\Windows\Logs\ServerManager.log with 80070422 contents if the issue still exists If there are more inquiries on this issue, please feel free to let us know. RegardsRick Tan TechNet Community Support

You hit the nail on the head, first time. Well done and thanks! The "Windows Modules Installer" was disabled. Thanks! Charles.