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Study Guide: CompTIA A+ Core Certification: Common Symptoms of PC Security Issues
Source: https://www.fatskills.com/comptia-a-exam/chapter/comptia-a-core-certification-common-symptoms-of-pc-security-issues

CompTIA A+ Core Certification: Common Symptoms of PC Security Issues

By Fatskills Exam Guides Team — the exam nerds behind 28,500+ quizzes and 2.1M practice questions across 500+ global exams.

⏱️ ~2 min read
Symptom Possible Causes
No access to the network Internet connectivity problems that do not affect all computers and devices on the network could be caused by malware. Run troubleshooters to repair the problem. If the problem continues to occur, scan the systems.
Desktop alerts The Notifications and Quick Actions center is easily accessed on the taskbar next to the time and date. Notifications can be edited by going to Settings > System > Notifications and Actions. Options include connectivity, VPN, network, and settings notifications, as well as notifications from apps. OS updates also can be sent here. A regular check of the Notifications and Quick Actions center can help keep small problems from turning into big ones.
False alerts regarding antivirus protection Security alerts from Windows Defender or from your OS might indicate malware infection or other problems. Sometimes alerts that pop up without any notification in Defender or the Action Center are attempts to infect your system by tricking you into clicking a phishing link in the pop-up. Scan the system. Rogue antivirus programs look like legitimate antivirus programs but actually are designed to infect your system or phish users for personal information. Uninstall any such program and scan the computer.
Altered system or personal files Malware infections might rename system files (such as msconfig, regedit, and taskmgr) that can help block malware. Files can go missing or be renamed on your storage devices if they are corrupted, infected with malware, unknowingly hidden, or automatically moved by a program without user acknowledgement. Files that have actually disappeared and have not been moved or artificially hidden can often be recovered with undeletion software that scans the hard drive for files that are no longer recorded in the file allocation table, the storage device data that tracks where files start and end. Undeleted malware-infected files can reinfect a system if they are not properly cleaned before use.
Unwanted notifications within the OS Notifications can be easily managed in Windows 10 by going to Settings > System > Notifications & Actions. From this page, you can customize notifications and alerts from Windows and from individual apps that are installed.
OS update failures A common reason OS updates fail is lack of disk space. Make sure ample free disk space is available; some updates can be quite large. Also make sure that automatic updates are not blocked by antivirus protection settings.

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