What Is Adware and Why Should You Care?

Adware is a type of unwanted software that displays intrusive advertisements on your device — often without your knowledge or consent. While it may seem like a minor annoyance, adware can slow down your system, track your browsing habits, and in some cases, serve as a gateway for more dangerous malware.

Unlike viruses, adware typically doesn't destroy files. Instead, it quietly monetises your attention by injecting ads, redirecting searches, and harvesting data about what you click on and what sites you visit.

How Adware Gets On Your System

Adware almost never announces itself. It typically arrives through one of these methods:

  • Bundled software installers: Free programs (download managers, PDF converters, games) often bundle adware as an optional "extra" that's pre-ticked during installation.
  • Fake browser extensions: Extensions that promise useful features like "speed boosters" or "coupon finders" may actually inject ads or redirect your traffic.
  • Malicious websites: Some sites use drive-by downloads to silently push adware onto your system when you visit.
  • Cracked or pirated software: Unofficial software downloads are a common delivery mechanism for adware and worse.

Warning Signs Your Browser Has Adware

Not sure if you're infected? Look for these telltale signs:

  • Your homepage or default search engine has changed without your input
  • Excessive pop-up ads appearing even on trusted websites
  • New browser toolbars or extensions you didn't install
  • Searches being redirected to unfamiliar engines
  • Pages loading slowly or browser crashing frequently
  • Ads appearing on websites that normally don't show them

How to Remove Adware Step by Step

Step 1: Uninstall Suspicious Programs

On Windows, go to Control Panel → Programs → Uninstall a Program. Sort by installation date and look for anything you don't recognise installed recently. Remove it.

Step 2: Remove Unwanted Browser Extensions

In Chrome, go to Menu → More Tools → Extensions. In Firefox, go to Menu → Add-ons and Themes. Disable and remove anything you didn't deliberately install.

Step 3: Reset Browser Settings

Most browsers allow you to restore default settings. In Chrome, go to Settings → Reset and Clean Up → Restore settings to their original defaults. This removes any injected homepage or search engine changes.

Step 4: Run a Dedicated Adware Scanner

Use a reputable free tool like Malwarebytes AdwCleaner (Windows) or Malwarebytes for Mac to scan for and remove adware components that manual removal might miss. These tools specifically target adware, PUPs (Potentially Unwanted Programs), and browser hijackers.

Step 5: Check Your Hosts File

Some adware modifies your system's hosts file to redirect traffic. On Windows, the file is located at C:\Windows\System32\drivers\etc\hosts. Open it in Notepad and remove any suspicious entries.

How to Prevent Adware in the Future

  • Always choose Custom installation when installing free software and uncheck bundled extras
  • Download software only from official websites or verified app stores
  • Keep your browser and OS updated
  • Use a browser with built-in protection (Firefox, Brave) or install a trusted ad blocker like uBlock Origin
  • Run periodic scans with a security tool even if you feel your device is clean

Adware is persistent but removable. The key is catching it early and being cautious about what you install. With a few simple habits, you can keep your browser clean and your data private.