Intermediate level · Module 4: Malware Removal and Security Hygiene · Lesson 2 of 3
Safe Malware Removal
Remove malware without losing data or missing anything.
In this lesson you will
- Follow a safe removal process
- Decide when to reinstall
Key concepts
isolationscansstart-up and extension reviewreinstall decision
The lesson
Disconnect the computer from the network, back up user files (not programs) and scan with Microsoft Defender, including an offline scan.
Remove unknown programs, browser extensions and start-up entries, and reset browsers.
If the system remains unstable, security tools are disabled or ransomware is involved, back up data and reinstall cleanly.
Step by step
- Isolate the computer.
- Run full and offline scans.
- Remove programs, extensions and start-up entries.
- Verify or reinstall.
Practice activity
Clean the lab image and verify.
Expected result: A clean system with the steps documented.
Check your understanding
-
Why disconnect an infected computer?
Show answer
To stop spreading and data theft.
-
When should you reinstall instead of cleaning?
Show answer
When the system remains unstable, security tools are disabled or ransomware is involved.
Taught live by an instructor — online or in person. Free course lessons are for self-study and do not lead to a certificate — see registration options.