This is because system files can only be loaded during the computerDriver asuss boot process. Cite this definition: TechTerms - The Tech Terms Computer Dictionary. This page contains a technical definiton of Installer. It explains in computing terminology what Installer means and is one of many software terms in the TechTerms dictionary. All definitions on the TechTerms website are written to be technically accurate but also easy to understand. If you find this Installer definition to be helpful, you can reference it using the citation links above. If you think a term should be updated or added to the TechTerms dictionary, please email TechTerms!