A ransomware that encrypts the hard drive on a Monday morning, a banking session intercepted on hotel Wi-Fi, a phishing email that perfectly imitates your internet service provider: these situations are no longer just bad luck, but rather a result of misconfiguration or habits on the workstation. Strengthening the security of your computer on a daily basis relies on a series of concrete adjustments and reflexes applied to each layer of the system.
Updates and zero-day vulnerabilities: every day without a fix counts
A critical vulnerability published on Tuesday can be exploited as early as Wednesday. Zero-day vulnerabilities (unknown to the publisher at the time of the attack) have been on the rise in recent years. The fix eventually exists, but between its publication and installation, the window of opportunity remains wide open.
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On Windows, enable automatic system updates, then manually check for third-party software updates weekly: browser, PDF reader, office suite. These are the ones that concentrate the exploited vulnerabilities, much more than the core of the system.
Another concrete reflex: uninstall all unused software. Every application left on the hard drive represents a potential entry point if its publisher no longer maintains it. A machine with thirty programs, half of which have been dormant for months, is much more exposed than a streamlined machine. We can assist you with this type of audit: just access the security page of Simpler Computing to see the services offered in this regard.
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Firewall and antivirus: real configuration against false sense of security
An antivirus installed but never configured or updated barely protects. What makes the difference is the combination of an active firewall, up-to-date antivirus, and user vigilance.
Check the status of the Windows firewall
The built-in Windows firewall is enabled by default. However, some third-party software installations disable it without warning. To check: Settings, Privacy and security, Windows Security, Firewall and network protection. The three profiles (domain, private, public) should show “enabled”.
A disabled firewall on the public profile directly exposes the machine to every connection on a shared Wi-Fi network (café, train station, coworking). This is the most common intrusion scenario on a laptop.
Adjust the antivirus beyond default settings
Whether you use Windows Defender or a third-party antivirus, enable real-time scanning and schedule a full scan every week. Opinions vary on the usefulness of a paid antivirus compared to Defender for home use, but the conclusion remains the same: an antivirus that does not scan regularly is useless.
- Enable ransomware protection (controlled folder access in Defender) to block any modification of your documents by an unknown program.
- Remove overly broad exceptions: some users exclude entire folders from scanning to improve performance, thus creating exploitable blind spots.
- Ensure that the signature database updates daily, not just during scheduled scans.
Passwords and authentication: what really lasts over time
Creating a complex password is not difficult. The real problem is not falling back into convenience after two weeks by reusing the same identifier everywhere.
A password manager (KeePass, Bitwarden, or equivalent) solves this deadlock. You remember only one strong master password, and the manager generates and stores all the others. Adopting a manager drastically reduces the risk of reusing the same identifier across multiple sites.
Two-factor authentication (2FA) adds concrete protection on top. Prefer a TOTP authentication app rather than SMS, which is more vulnerable to interception. Activate it primarily on your main email, bank account, and any online storage service.
AI-Personalized Phishing: Adapting Your Verification Reflexes
The fraudulent email filled with spelling mistakes belongs to the past. Current attempts take on the tone, logo, and sometimes the conversation history of the legitimate sender, thanks to artificial intelligence that personalizes each message.
The defense relies on behavior, not a tool:
- Never click on a link in an email asking you to “confirm” or “update” your information. Open your browser and type the website address yourself.
- Hover over links before clicking to display the actual URL. A domain like “banque-france-securite.xyz” has nothing to do with the official site.
- Be wary of unexpected attachments, even from a known contact. A compromised account sends emails to the entire address book.
- Never leave a session permanently open on a sensitive service (banking, email, administration). Log out after each use, especially on a shared computer.
Consistently closing your sessions limits the impact of unauthorized access to the machine. A closed session forces the attacker to authenticate, which blocks the majority of opportunistic access.
Backups and encryption of sensitive data
Backing up does not prevent the attack. It neutralizes the consequences. A regular backup on a disconnected medium protects against ransomware, which also encrypts external drives that remain plugged in continuously.
In practice: back up at least once a week on an external drive that you then unplug, or on an encrypted online storage service. Test the restoration at least once a quarter. A backup that has never been restored is not a backup; it’s a gamble.
For truly sensitive files (tax documents, professional data), enable disk encryption via BitLocker (Windows Pro) or VeraCrypt (all versions). An encrypted disk remains unreadable even in the event of physical theft of the machine.
Up-to-date system, verified firewall, password manager in place, systematic distrust of incoming emails, backup unplugged after each copy: these five points cover the vast majority of risks to which a personal or professional computer is exposed on a daily basis.