What is Windows Defender?
Windows Defender is malware protection that is included with and built into Windows 8. This software helps identify and remove viruses, spyware, and other malicious software.
Windows Defender runs in the background and notifies you when you need to take specific action. However, you can use it anytime to scan for malware if your computer isn’t working properly or if you clicked a suspicious link online or in an email message.
To scan your computer with Windows Defender:
Tap or click the Search charm, search for defender, and then open Windows Defender.
On the Home tab, click a scan option, and then tap or click Scan now.
In Windows 8, Windows Defender replaces Microsoft Security Essentials
You can’t use Microsoft Security Essentials with Windows 8 or Windows RT, but you don’t need to. If you install two different kinds of antivirus software, they might conflict. If you want to use antivirus software from another provider, uninstall Windows Defender first.
What is Windows Defender Offline?
Some malicious software will not allow you to access Windows Defender or other antivirus software. To help detect and remove the malware, you can start your computer by using a Windows Defender Offline CD, DVD, or USB flash drive
How to protect your Windows 10 PC
Turn Windows Defender on or off
When you start up Windows 10 for the first time, Windows Defender is on and working to protect your PC by scanning for malicious software. It will turn itself off if you install another antivirus app.
Windows Defender uses real-time protection to scan everything you download or run on your PC. Turn off real-time protection temporarily by selecting the Start icon button, and then selecting Settings > Update & security > Windows Defender.
Help protect my computer with Windows Defender
When you start up Windows 10 for the first time, Windows Defender is on and working to protect your PC by scanning for malicious software.
Windows Defender uses real-time protection to scan everything you download or run on your PC. Turn off real-time protection temporarily by selecting the Start button and then selecting Update & security > Windows Defender.
If you have Windows 10, you can’t get Microsoft Security Essentials. But you don’t need it because you already have Windows Defender, which provides the same level of protection. Windows Defender will turn itself off if you install another antivirus app.
Windows Update downloads updates for Windows Defender automatically to help keep your PC safe and protect it from attacks.
Schedule a scan in Windows Defender
Windows Defender regularly scans your PC to help keep it safe. If you want to set your own scan schedule:
Search for and open Schedule tasks.
In the left pane, expand Task Scheduler Library > Microsoft > Windows and then scroll down and double-click the Windows Defender folder.
In the top-center pane, double-click Windows Defender Scheduled Scan.
Select the Triggers tab, and then select New.
Set your time and frequency, and then select OK.
Turn Windows Defender real-time protection on or off
Open Windows Defender by clicking the Start button. In the search box, type Defender and then, in the list of results, click Windows Defender.
Click Tools, and then click Options.
Click Real-time protection, and then select the Use real-time protection (recommended) check box.
Select the options you want, and then click Save. Administrator permission required If you’re prompted for an administrator password or confirmation, type the password or provide confirmation.
To help protect your privacy and your computer, we recommend that you select all real-time protection options.
To turn off real-time protection, follow steps 1 through 3, and then clear the Use real-time protection (recommended) check box.