I've seen a number of instances of this error over the last few days since we released WinFX Runtime Components Beta 2, and wanted to highlight it right here on the blog to ensure people knew about it.
The symptom is that on installing the WinFX Runtime Components on a machine that previously had an earlier release, setup fails to complete during the installation of Windows Communication Foundation, giving a fatal error 1603. This is due to an InfoCard service that we have a problem uninstalling.
It's actually documented in the readme, but I guess I'm not the only one who doesn't pay a blind bit of attention to those! Here's the extract that includes the workaround:
WinFX installation fails with this error:
ERROR_INSTALL_FAILURE 1603 Fatal error during installation
ServiceModelReg [15:48:08:041]: Installing: Microsoft Digital Identity Service (idsvc)
ServiceModelReg [15:48:08:073]: Error: System.ComponentModel.Win32Exception: The name is already in use as either a service name or a service display name
To resolve this issue:
Hope this helps out a few folk!