This document discusses popular Windows applications in various categories such as office applications, anti-viruses, web browsers, multimedia players, converters, and messaging applications. It provides details on specific applications like Microsoft Office, Adobe Reader, Norton, Avast, Kaspersky antiviruses, Internet Explorer, Chrome, Firefox and Safari browsers, Windows Media Player and other media players, format converters, and messenger applications like Facebook Messenger, Skype, and Windows Live Messenger. Comparisons are made between antivirus applications Norton, Avast, and Kaspersky highlighting their price, protection coverage, and other features.