Notification ads keep sliding in from the bottom corner of your screen, hawking fake virus warnings, sketchy giveaways, and adult content even when your browser is closed. You did not subscribe to any of this on purpose, and clearing your history does nothing. The good news is that almost all of these alerts come from website push notifications you (or a piece of adware) approved at some point, and you can shut them off in a few minutes without any third-party cleaner tools.
This guide walks you through stopping the notifications at their source in Microsoft Edge and Google Chrome on a Windows PC, tightening the pop-up blocker, and then using the Windows Security app to rule out adware behind the spam. Every step below uses tools already built into Windows 10, Windows 11, and the browsers themselves.
Shut Off Notification Ads From a Single Site in Microsoft Edge
The spam is almost always website push notifications, not Windows system pop-ups. That distinction matters because the fastest fix lives inside the browser permission that allowed them in the first place. In Edge, the quickest route is per site.
- 1.Open the website that is sending the ads.
- 2.Select the View site information icon, which sits to the left of the address bar.
- 3.Under Permissions for this site, find Notifications and choose Block.
If you would rather manage everything from one list, go to Settings > Privacy, search, and services > Site permissions > All sites. Select the offending website, find the Notifications setting, and choose Block from the dropdown. You can always re-allow a legitimate site later by returning to the same menu and switching it back to Allow.
Block Notification Ads From a Site in Google Chrome
Chrome handles this the same way conceptually, with its own menus. On a computer, the quickest route is the View site information icon to the left of the address bar; next to Notifications, select Block.
To manage them through the full settings list, open Chrome and select More (the three-dot menu) > Settings > Privacy and security > Site Settings > Notifications. There you can add the site's web address under the "Not allowed to send notifications" list to block it for good.
Turn On the Pop-Up and Redirect Blocker in Edge
Sometimes the ads are not notifications at all but pop-up windows or surprise redirects to other tabs. If that is what you are seeing, make sure Edge's pop-up blocker is doing its job. This guidance applies to the current Microsoft Edge.
- 1.Select Settings and more (the three-dot menu)
> Settings. - 2.Go to Privacy, search, and services
> Site permissions > All permissions > Pop-ups and redirects. - 3.Turn on the Blocked (recommended) toggle.
With that enabled, Edge stops most unwanted windows before they ever open. If a site you trust legitimately needs a pop-up, you can add an exception for just that site later.
Confirm Chrome's Pop-Up Blocker Is Active
In Chrome on a computer, pop-ups are blocked by default, so this is usually a quick verification rather than a fix. Still, adware can quietly change the setting, so it is worth confirming.
Open More (the three-dot menu) > Settings > Privacy and security > Site Settings > Pop-ups and redirects, and make sure "Don't allow sites to send pop-ups or use redirects" is selected. If it was set to allow, switching it back stops the flood of new windows immediately.
Open Windows Security to Rule Out Adware
If notifications keep returning after you block them, or if you never approved them in the first place, an adware infection may be re-granting the permission. Windows Security is the built-in tool for checking. Search for Windows Security in the Start menu, open it, then select Virus & threat protection.
You can jump straight to that screen with the shortcut windowsdefender://threat/. This is the same screen used for scanning and for checking your protection settings on both Windows 10 and Windows 11.
Scan Your PC for Adware and Malware
Start with a quick pass, then go deeper if anything looks off. In Windows Security > Virus & threat protection, select Quick scan to check the folders where threats are commonly found. You can also launch this directly with windowsdefender://quickscan/.
For a more thorough check, select Scan options, choose Full scan (which scans every file and program on your device), then select Scan now. The shortcut windowsdefender://fullscan/ opens the same Full scan, and windowsdefender://customscan/ opens a Custom scan if you only want to check specific files and folders you choose.
Run a Microsoft Defender Offline Scan for Stubborn Infections
Some adware resists removal while Windows is running because it is active in memory. The Microsoft Defender Offline scan handles this by restarting your PC and scanning in the Windows Recovery Environment, where the malware cannot hide.
Save any open files first, because your PC restarts during this scan. Then, in Windows Security, select Virus & threat protection > Scan options > Microsoft Defender Antivirus (offline scan), then Scan now. You can also start it with windowsdefender://wdoscan/. After the scan finishes and Windows boots back up, review the results in Windows Security under Protection history.
Make Sure Real-Time Protection Is On
Real-time protection continuously monitors your device for viruses, malware, and spyware, so adware that tries to reinstall itself gets caught as it lands. To check it, open Windows Security and select Virus & threat protection > Manage settings (under Virus & threat protection settings), then make sure Real-time protection is set to On. The shortcut windowsdefender://threatsettings/ opens this Manage settings page directly.
If you ever turn this off, files you open or download will not be scanned, and Windows turns real-time protection back on automatically after a short while. You can confirm Defender's running mode in PowerShell with Get-MpComputerStatus | select AMRunningMode, which returns Normal, Passive, or EDR Block Mode.
Why Real-Time Protection Sometimes Will Not Turn On
If real-time protection looks off and you cannot switch it back on, that is usually not a sign of infection by itself. There are three common, documented reasons.
First, a non-Microsoft antivirus may be installed. On Windows 10 and Windows 11, when a non-Microsoft antivirus is the primary solution, Microsoft Defender Antivirus automatically moves into a passive or disabled state, and in that state its real-time protection does not run. It re-enables automatically if the other product expires, is uninstalled, or stops providing real-time protection.
Second, Tamper Protection may be on, which must be turned off before you can turn Real-time protection off. Third, the device may belong to an organization, where an administrator or policy prevents the change.
Check and Manage Tamper Protection
Tamper Protection prevents malicious apps from changing key Microsoft Defender Antivirus settings, including real-time protection and cloud-delivered protection. On a personal PC, leaving it on is a good defense against adware that tries to weaken your security.
You will find it in Windows Security > Virus & threat protection > Manage settings (under Virus & threat protection settings) > Tamper Protection. Remember that if Tamper Protection is on, you must turn it off before you can turn off Real-time protection. This applies to both Windows 10 and Windows 11.
See Which Antivirus Is Actually Protecting You
If you suspect a third-party antivirus has taken over and pushed Defender into a passive or disabled state, you can confirm exactly which product is active. Open the Windows Security app, select Virus & threat protection, then under "Who's protecting me?" select Manage providers.
On the Security providers page, under Antivirus, you should see "Microsoft Defender Antivirus is turned on" if it is your active protection. If a different product is listed instead, that is why Defender's real-time protection is not running, and you would manage protection through that product or remove it.
Frequently Asked Questions
Why do the notification ads keep coming back after I block them?
If a single site reappears after you block it, you may have re-allowed it, or adware on your PC could be re-granting the permission. Run a Quick scan and then a Full scan in Windows Security, and if the spam persists, run a Microsoft Defender Offline scan to catch malware that resists removal while Windows is running.
Are these ads notifications or pop-ups, and does it matter?
It matters because the fix differs. Notification ads come from website push permissions and are blocked under Notifications in Edge or Chrome site settings; pop-up windows and redirects are handled by each browser's pop-up and redirect blocker. If you are unsure, address both: block the site's notifications and confirm the pop-up blocker is on.
Does turning off Defender's real-time protection mean I have malware?
Not on its own. The most common reasons real-time protection is off are that a non-Microsoft antivirus has taken over (which moves Defender to a disabled or passive state automatically), that Tamper Protection is enabled, or that an organization's policy controls the setting. Check Manage providers to see which antivirus is active before assuming an infection.
Will a Microsoft Defender Offline scan delete my files?
The offline scan targets malware, not your personal documents, but it does restart your PC and run in the Windows Recovery Environment, so save any open work first. When your PC boots back up, you can review exactly what it found in Windows Security under Protection history.
How do I re-enable notifications for a website I actually want?
Return to the same menu where you blocked it. In Edge, open Settings > Privacy, search, and services > Site permissions > All sites, select the site, and choose Allow. In Chrome, open the three-dot menu > Settings > Privacy and security > Site Settings > Notifications and move the site back to the allowed list.
