Windows Security continually scans for malware mal icious soft ware , viruses, and security threats. In addition to this real-time protection, updates are downloaded automatically to help keep your device safe and protect it from threats.
Some features will be a little different if you're running Windows 10 or 11 in S mode. But don't worry—the built-in security of this mode automatically prevents viruses and other threats from running on your device, and you'll receive security updates automatically. Windows Security is built-in to Windows and includes an antivirus program called Microsoft Defender Antivirus. If you have another antivirus app installed and turned on, Microsoft Defender Antivirus will turn off automatically.
If you uninstall the other app, Microsoft Defender Antivirus will turn back on automatically. For info on how to uninstall an app, see Repair or remove an app in Windows. To change your user account to an admin account, see Create a local user or administrator account in Windows. Some of these options are unavailable if you're running Windows 10 in S mode. Account protection - Access sign-in options and account settings, including Windows Hello and dynamic lock.
You'll have exploit protection and you can customize protection settings for your devices. Device security - Review built-in security options to help protect your device from attacks by malicious software. Open Windows Security settings. Yellow means there is a safety recommendation for you. Red is a warning that something needs your immediate attention. When you're concerned about risks to a specific file or folder, you can right-click the file or folder in File Explorer, then select Scan with Microsoft Defender.
If you suspect there's malware or a virus on your device, you should immediately run a quick scan. This is much faster than running a full scan on all your files and folders. Under Current threats , select Quick scan or in early versions of Windows 10, under Threat history , select Scan now. If the scan doesn't find any issues, but you're still concerned, you may want to check your device more thoroughly. Under Current threats , select Scan options or in early versions of Windows 10, under Threat history , select Run a new advanced scan.
Although a shorter key lifetime results in better security, it also reduces performance because of the more frequent renegotiating of the quick mode SA.
We recommend that you use the default value unless your risk analysis indicates the need for a different value. After the list contains only the combinations you want, use the up and down arrows to the right of the list to rearrange them in the correct order for your design. The algorithm combination that is first in the list is tried first, and so on. Select the data integrity and encryption algorithms that you want to use to help protect the data sessions between the two computers.
If the algorithm combinations displayed in the list are not what you want, then do the following:. From the second column, remove any of the data integrity and encryption algorithms that you do not want by selecting the algorithm combination and then clicking Remove.
Add any required integrity and encryption algorithm combinations by clicking Add , and then doing the following:. Select the appropriate encryption algorithm. We recommend that you do not include DES in any combination. In Key lifetime in minutes , type the number of minutes.
When the specified number of minutes has elapsed, any IPsec operations between the two computers that negotiated this key will require a new key. Although a shorter key lifetime results in better security, it also reduces performance because of the more frequent rekeying.
If a cached copy of the catalog file is not available in the cache folder, the WFP feature requests the appropriate media to retrieve a new copy of the catalog file.
The System File Checker tool gives an administrator the ability to scan all the protected files to verify their versions. The SfcScan value in the following registry key has three possible settings:. Default value. By default, all system files are cached in the cache folder, and the default size of the cache is MB.
Because of disk space considerations, it may not be desirable to maintain cached versions of all system files in the cache folder. To change the size of the cache, change the setting of the SFCQuota value in the following registry key:.
The administrator can make the setting for the SFCQuota value as large or small as needed. There are two cases in which the cache folder may not contain copies of all protected files, regardless of the SFCQuota value:. Not enough disk space. Network Install. Additionally, all drivers in the Driver. WFP can restore these files from the Driver.
If WFP detects a file change and the affected file is not in the cache folder, WFP examines the version of the changed file that the operating system is currently using.
If the file that is currently in use is the correct version, WFP copies that version of the file to the cache folder. If the file that is currently in use is not the correct version, or if the file is not cached in the cache folder, WFP tries to locate the installation source.
If WFP cannot find the installation source, WFP prompts an administrator to insert the appropriate media to replace the file or the cached file version.
To modify the cache location, you must add this value. For more information about the WFP feature, click the following article number to view the article in the Microsoft Knowledge Base:. Replacement of protected system files is supported only through the following mechanisms: Windows Service Pack installation using Update.
The network install path, if the system was installed using network install. Need more help? Expand your skills. Get new features first. Was this information helpful?
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