During the installation of a patch on a Performance Center (PC) 11.00 Host or Server, if the process is stuck on ‘Registering Modules’ the reason for this error is because the MSI process is stuck on registering a DLL and this is blocking the installation from completing the process.
To fix this issue
• Open the Task Manager,
• Kill the appropriate MSIEXEC process (the one with the highest CPU).
This will free the installation lock and the patch installation will complete.