10 Ways to Protect Your Computer from Hackers

From the Experts: 10 Ways to Protect Your Computer from Hackers in 2026

Hacking refers to unauthorized access to computer systems or networks with the intent to steal, alter, or destroy data. In practice, most hackers don't break down the door — they walk in through unpatched software, reused passwords, and convincing phishing messages. That means the most effective protections are things you can set up yourself, usually in an afternoon.

This guide covers 10 ways to protect your computer from hackers, updated for 2026 with the current menu paths for Windows 11, macOS, and iPhone, plus what has changed in multi-factor authentication and phishing tactics over the last few years.

10 Ways to Protect Your Computer from Hackers at a Glance

1. Keep your operating system and software updated
2. Use strong, unique passwords — or passkeys
3. Turn on multi-factor authentication (MFA)
4. Run reputable antivirus and anti-malware protection
5. Encrypt your data
6. Learn to spot phishing
7. Secure your home network
8. Back up your data with the 3-2-1 rule
9. Use firewalls
10. Build everyday cybersecurity awareness

Each section below explains what to do and exactly where to find the setting on current devices.

Tip 1: Keep Your Operating System and Software Updated

Software updates contain security patches that close the vulnerabilities hackers actively scan for. An unpatched computer is the single easiest target on the internet, because attackers automate their search for known, already-fixed flaws.

Start with your operating system. Windows 10 reached end of support on October 14, 2025, and the consumer Extended Security Updates program winds down in October 2026 — so if you're still running it, moving to Windows 11 should be your top priority. On Windows 11, open Settings > Windows Update and turn on "Get the latest updates as soon as they're available." On a Mac, Apple replaced the old System Preferences app with System Settings; go to System Settings > General > Software Update and enable automatic updates. On an iPhone or iPad, it's Settings > General > Software Update > Automatic Updates.

Don't stop at the operating system. Browsers like Chrome and Edge update themselves but only finish the job when you relaunch them, and routers, printers, and smart-home devices need firmware updates too. K3 Technology recommends enabling automatic updates everywhere they're offered, so staying current doesn't depend on your memory.

Tip 2: Use Strong, Unique Passwords — or Passkeys

Password guidance has changed: length now matters more than forced complexity. A 16-character passphrase made of unrelated words is far harder to crack than a short password with a symbol swapped in, and it's easier to remember. Avoid anything guessable from your social media — birthdays, pets, teams.

Just as important: never reuse passwords across accounts. When one site is breached, attackers immediately try that same email-and-password combination everywhere else — a technique called credential stuffing. A reputable password manager solves this by generating and storing a unique password for every account, so you only have to remember one.

Where available, go a step further and switch to passkeys. Google, Apple, and Microsoft accounts all support them now: you sign in with your device's fingerprint, face, or PIN instead of a password. Because there's no password to steal or type into a fake site, passkeys are resistant to phishing by design.

Tip 3: Turn On Multi-Factor Authentication

Multi-factor authentication (MFA) adds a second proof of identity beyond your password, so a stolen password alone isn't enough to get into your account. Prioritize it on email, banking, and social media — email first, because whoever controls your inbox can reset everything else.

The tools have improved since MFA meant typing a six-digit code. Modern push-based apps use number matching to stop attackers who spam approval requests hoping you'll tap "approve" out of fatigue: Microsoft Authenticator shows a two-digit number on the sign-in screen that you must type into the app, and Duo Mobile's Verified Duo Push works the same way, asking you to enter a code from the login screen before the sign-in goes through. Prefer an authenticator app, hardware security key, or passkey over text-message codes, which can be intercepted through SIM-swap scams.

If your workplace runs Microsoft 365, note the naming change on the business side: Azure Active Directory is now Microsoft Entra ID, and administrators manage sign-in security and MFA policies from the Microsoft Entra admin center rather than the old Azure AD portal.

Tip 4: Run Reputable Antivirus and Anti-Malware Protection

Antivirus software continuously scans for malicious programs — viruses, spyware, ransomware — and stops many of them before they run. The good news: capable protection is already built into your computer. Windows 11 includes Microsoft Defender Antivirus, managed through the Windows Security app, with real-time protection and a ransomware safeguard called Controlled folder access that you can switch on under Virus & threat protection. macOS ships with its own built-in defenses, XProtect and Gatekeeper, which block known malware and unverified apps.

If you choose a third-party security suite instead, pick a well-reviewed, established vendor, keep it updated, and run only one real-time antivirus engine at a time — two scanners fighting over the same files causes problems without adding protection. For businesses, endpoint detection and response (EDR) tools take this further by watching for suspicious behavior rather than just known malware signatures.

Tip 5: Encrypt Your Data

Encryption converts your data into an unreadable format that can only be unlocked with the right key — so if your laptop is lost or stolen, the thief gets hardware, not your files. It's one of the strongest protections for sensitive personal information like financial records and identity documents.

Turning it on is easier than it used to be. On Windows 11, many new PCs enable device encryption automatically when you sign in with a Microsoft account — verify under Settings > Privacy & security > Device encryption, or use BitLocker on Pro editions. On a Mac, enable FileVault at System Settings > Privacy & Security > FileVault. iPhones and iPads encrypt their contents automatically once you set a passcode, and Apple's optional Advanced Data Protection extends end-to-end encryption to most iCloud data, including device backups.

For data in transit, stick to websites using HTTPS (the padlock in your browser) and be cautious about entering sensitive information over public Wi-Fi.

Tip 6: Learn to Spot Phishing

Phishing remains the most common way hackers get in — a message that impersonates someone you trust to trick you into handing over credentials or opening malware. K3 Technology teaches the SLAM method: scrutinize the Sender, Links, Attachments, and Message.

On a computer, hover over links to reveal the real destination before clicking. In the iPhone Mail app, tap the sender's name at the top of the message to see the actual email address behind the display name, and touch and hold any link to preview its URL before opening it; if a message is clearly a scam, use Mail's Report Junk option. Treat unexpected attachments as hostile until verified — ideally by contacting the sender through a channel you already trust.

Two updates for 2026: first, AI-written phishing messages have largely eliminated the telltale typos and broken grammar, so judge a message by what it asks you to do — urgency, secrecy, payments, credentials — not how polished it looks. Second, QR-code phishing ("quishing") is now common on parking meters, posters, and emailed "documents." A QR code is just a link you can't read; give it the same scrutiny you'd give one.

Tip 7: Secure Your Home Network

Securing your network protects every device behind it. K3 Technology recommends working through this checklist on your router:

1. Change the router's admin password: Default credentials are published online and are the first thing attackers try.
2. Use WPA3 encryption: Choose WPA3 (or WPA2 if your devices don't support it) in your router's wireless settings. Never leave a network open or on the long-obsolete WEP.
3. Turn on automatic firmware updates: Router vulnerabilities are a favorite target because so many routers never get patched.
4. Set a strong, unique Wi-Fi password: Treat it like any other important password — long and not reused.
5. Use the guest network: Put visitors and smart-home gadgets on the guest network so they can't reach your computers.
6. Disable WPS and remote management: Both are convenience features that widen your attack surface; turn them off unless you have a specific need.

One honest correction to older advice (including earlier versions of this article): hiding your network name (SSID) and MAC address filtering add very little real protection — both are trivial for an attacker to bypass — so spend your effort on encryption and updates instead.

Tip 8: Back Up Your Data with the 3-2-1 Rule

Backups don't stop hackers, but they take away their leverage. If ransomware encrypts your files, a clean backup turns a catastrophe into an inconvenience. Follow the 3-2-1 rule: keep three copies of important data, on two different types of storage, with one copy offsite or in the cloud.

In practice, that can be as simple as combining a cloud service — OneDrive, iCloud Drive, or Google Drive, which also keep version history so you can roll back damaged files — with a local backup using Windows File History or macOS Time Machine to an external drive. Disconnect the external drive between backups so ransomware can't encrypt it along with everything else, automate whatever you can, and periodically test that you can actually restore a file. An untested backup is a hope, not a plan.

Tip 9: Use Firewalls

A firewall acts as a barrier between your computer and the internet, inspecting network traffic and blocking unsolicited connection attempts. You almost certainly have two already — the job is making sure both are switched on.

Your router provides the hardware firewall, filtering traffic before it ever reaches your devices. On top of that, Windows 11's software firewall is enabled by default; confirm it under Windows Security > Firewall & network protection. On a Mac, turn it on at System Settings > Network > Firewall. When a program asks for permission through the firewall, don't click "Allow" reflexively — only grant access to software you recognize and trust.

Tip 10: Build Everyday Cybersecurity Awareness

Technology handles nine of these ten tips; the last one is you. Most successful attacks succeed by persuading a person, not by defeating a machine — so knowing the current tricks is a genuine security control. That includes recognizing phishing patterns, questioning urgency, and pausing before acting on any unexpected request involving money, credentials, or sensitive data.

The 2026 twist is AI impersonation. Voice cloning and deepfake video mean "it sounded exactly like them" is no longer verification. If a call, voicemail, or video message makes an unusual request — a wire transfer, a gift card purchase, an urgent password reset — verify through a second channel you already trust, like calling the person back on their known number. For families and businesses alike, short, regular conversations about current scams do more good than a single annual lecture.

Frequently Asked Questions

How can I tell if my computer has been hacked?

Common warning signs include programs or browser extensions you didn't install, your browser redirecting to unfamiliar sites, password-reset emails you didn't request, security software that has been switched off, sign-in alerts from unfamiliar locations, and sudden unexplained slowness. No single symptom is proof on its own, but several together warrant a full antivirus scan and a review of your account activity.

What should I do first if I think my computer has been hacked?

Disconnect the computer from the internet to cut off the attacker's access, then use a separate, trusted device to change the passwords on your most important accounts — email first — and enable MFA on each. Run a full scan with your antivirus software, review recent account activity for anything you don't recognize, and if sensitive financial or business data may be involved, consider bringing in a professional to investigate before reconnecting.

Can hackers access my computer when it's turned off?

Generally no — a fully powered-off computer isn't reachable over a network. Keep in mind, though, that "asleep" isn't "off": a sleeping machine may still respond on the network, and features like Wake-on-LAN can power a computer back up remotely. Also remember that your cloud accounts stay online around the clock regardless of your computer's state, which is why strong passwords and MFA matter even when your PC is shut down.

Protecting one computer is manageable; protecting a whole organization's worth of them is a full-time job. K3 Technology is a managed IT and cybersecurity provider with offices in Denver and Dallas, helping businesses put these fundamentals — patching, MFA, backups, network security, and security awareness training — into consistent practice. If you'd like a hand securing your company's technology, contact K3 Technology to start the conversation.