What strategy can help against unsolicited software installations?

Avoiding unknown sources of software is an effective strategy to combat unsolicited software installations. This approach emphasizes the importance of being cautious about where software is downloaded from, ensuring that users only acquire programs from reputable and trusted sources. Unsolicited software often comes bundled with applications from dubious websites that may try to execute installations without the user's full consent or awareness. By steering clear of these unknown or unverified sources, users can significantly reduce the risk of inadvertently installing malicious software, adware, or programs that could compromise their system's security and performance.

The other strategies, while they may contribute to good practices in some areas, do not directly address the core issue of unwanted installations from untrustworthy sources. For instance, using the Internet freely can expose individuals to risky sites; regularly updating web browsers is important for security but doesn’t prevent unsolicited installations directly; and sharing passwords with friends can lead to security breaches rather than protecting against them. Thus, the focus on avoiding unknown software sources stands out as a practical and effective defense.