You might have unwanted software or malware installed on your computer if you experience:
- Pop-up ads and new tabs that won't go away
- Your Chrome homepage or search engine keeps changing without your permission
- Unwanted Chrome extensions or toolbars keep coming back
- Your browsing is hijacked, and redirects to unfamiliar pages or ads
- Alerts about a virus or an infected device
Tips:
- Use Safe Browsing in Chrome
- Avoid malware in the future
- Learn how to block or allow pop-ups in Chrome
Change your default ads permissions
To prevent intrusive or misleading ads, change your site settings.
- On your computer, open Chrome.
- At the top right, click More
Settings
- Click Site settings
- Select the option you want as your default setting.
Remove unwanted programs on your Mac
Before you reset your browser settings on your Mac, check your computer for unwanted programs.
Reset your browser settings
- On your computer, open Chrome.
- At the top right, select More
- Select Reset settings
If you reset your browser settings, you have to turn some extensions on. To turn extensions on, at the top right, select More 
If the steps above don't work, go to the Chrome Help Forum.
Tip: If you’re a website owner, learn how to resolve malware or unwanted software issues related to your downloads.