To modify the time displayed in the system tray, you should use the 'Clock, Language, and Region' feature in the Control Panel. This section provides options to change date and time settings, as well as regional and language options. It is the most appropriate location to make adjustments to the system clock display.

To manually install software from a DVD, you should browse the contents of the DVD and locate the Setup file. This is the standard procedure to initiate an installation process for most software.

A Windows service is a program or process that runs in the background and does not require user intervention. It is designed to perform specific functions or provide specific services, and it can start automatically when the operating system boots or manually by a user or another program. This allows the system to operate various services essential for hardware, software, and network tasks without requiring constant user interaction or monitoring.

To protect a computer against spyware, you should use Windows Defender. Windows Defender is an anti-malware component of Microsoft Windows, designed to prevent, remove, and quarantine spyware and other types of malware. It provides real-time protection, scanning for and mitigating potential threats as they arise.

Application Virtualization Sequencer is the tool specifically designed to create and manage virtual applications. It captures the necessary components of an application, allowing it to be deployed in a virtualized environment.