After a clean install the Mezzmo server should be set to run as a console process then you would need to change it to run as a Windows service and at this point do you see this error? It may be that the service registration is failing for some reason, please enable diagnostic logging http://www.mezzmo.com/wiki/doku.php?id=using_logging&s[]=diagnostic then try setting the Mezzmo server to run as a service and then after the error appears send the logs to support [at] conceiva [dot] com and we will have a look.