Virtualization has a profound impact on IT environments, as it abstracts the physical characteristics of computing resources from users. Virtualization techniques are mainly used for enhancing capacity (using excess computer resources efficiently), compatibility (running legacy applications on modern platforms), and manageability (easy patch management and deployment). However, one must not confuse virtualization technologies—such as OS virtualization and application virtualization—with virtualization itself. In principle, virtualization can be applied to provide an abstraction layer that helps solve complex problems in software architecture.
In windows 7 by default ISAPI & CGI Restrictions are not configured. To enable ISAPI & CGI restrictions, GoTo -> Control Panel -> Programs -> Click on "Windows features on or off -> Expand Internet Information Services - >Expand World Wide Web Services ->Select CGI and ISAPI extensions and Click OK. After enabling, Check in IIS, Open your IIS and the feature will be available. What is ISAPI and CGI restrictions : ISAPI and CGI restrictions are request handlers that allow dynamic content to execute on a server. These restrictions are either CGI files (.exe) or ISAPI extensions (.dll). You can add custom ISAPI or CGI restrictions if the IIS configuration system allows this.