Trying to upgrade Windows Server 2003 Standard R2 to Windows Server 2003 enterprise R2 and get an error when I select upgrade. "Setup cannot continue because some necessary information cannot be accessed in the registry."
"An I/O operation initiated by the registry failed unrecoverably. The registry could not read in, or write out, or flush, one of the files that contain the system's image of the registry"
I login as the domain Admin ( this is a secondary domain controller ) and even tried copying all of the file to disk and install from their.