This error means your Windows Installer service (the MSIserver in Windows that processes application installers) is either missing, corrupted, or otherwise not running.
Commonly, it is often the result of some previous program installation or uninstall not completing properly. Some users have had success using programs such as Revo to install Clooz (although this should not be taken as our endorsement of any program). There are also various solutions described on the Internet when you search for “Windows Installer Service could not be access”.
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