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Another reason this could happen is if the services already exist, such as in an upgrade scenario. For upgrades it is best to either remove the service manually prior to upgrading or uncheck the 'Install as a Service' option during the install. In many cases the application upgrade will have been successful so you would just need to start up the service again.
It is possible the vice Service User is not fully qualified, the . The Scheduler installation requires the user to be fully Scheduler Install requires the Service User to be fully qualified, for ; on local installs installations this can be ".\UserName", for domain installs it might on domain installations this can be "WhereScape\UserName" or or "UserName@Wherescape.,com"