A method of and system for securely executing an application on a computer system such that a user of the computer system cannot access or view unauthorized content available on the computer system or accessible using the computer system. To securely execute an such method and system may terminate any unauthorized processes executing (i.e., running) on the computer system application prior to execution of the application, and may configure the application such that unauthorized content cannot be accessed, including configuring the application such that unauthorized processes cannot be initiated (i.e., launched) by the application. Further, such system and method may terminate any unauthorized processes detected during execution of the application, and may disable any functions of the computer system that are capable of accessing unauthorized content, including disabling any functions capable of initiating processes on the computer system. The application being securely executed may be any of a variety of types of applications, for example, a browser application or an application for receiving answers to questions of an examination (i.e., an exam-taking application). Securely executing an application may be used for any of a variety of purposes, including, among other purposes, to assist preventing students from cheating on exams, to assist preventing students from not paying attention in class, to assist preventing employees from wasting time at work, and to assist preventing children from viewing content that their parents deem inappropriate.