It's the latest 4.9.26 version on a Windows XP Pro PC.  I am a Local Administrator on my PC.  I'm trying to do a server and client install....
It starts doing the installation and then the error message that pops up is.
Error 1001:  The installation failed, and the rollback has been performed.  --> An exception occurred in the OnAfterInstall event handler of System.ServiceProcess.ServiceInstaller.  --> Cannot open log for source 'Error in SetServiceParameters, err.'.  You may not have wrote access.  -->  The interface is unknown.