如果您使用 Avast 作为您的主要防病毒工具并且它不更新其病毒定义，您的计算机就有可能感染各种病毒和恶意软件。这种安全漏洞是一个严重的问题，需要立即修复。

Avast不会更新其病毒定义的一些常见原因可能是您的防火墙阻止了连接，您在计算机上设置了错误的日期和时间，或者Avast 应用程序^{(issue with the Avast app)}本身存在问题。

检查您的互联网连接^{(Check Your Internet Connection)}

Avast需要连接到 Internet 才能下载新的病毒定义。如果您的 Internet 连接不活跃或不可靠，Avast可能会遇到获取新病毒更新的问题。

要检查您的互联网连接，请在您的计算机上打开网络浏览器并尝试访问Google等网站。如果网站加载正常，则您的互联网正在正常运行。

如果该站点无法加载，则您的连接可能存在问题。您可以尝试自己解决问题，^{(try to fix the problem yourself)}也可以联系您的互联网服务提供商 ( ISP )。

手动更新 Avast 病毒定义和 Avast 应用程序^{(Manually Update Avast Virus Definitions and the Avast App)}

Avast允许您手动和自动下载病毒定义。无论^(Whether)您执行手动更新还是自动更新，Avast都会下载相同的病毒定义集。

您还应该保持Avast应用程序更新，因为较新的应用程序更新会带来改进并修复现有错误。

如果自动更新停止工作，您可以按照以下步骤运行手动更新并查看是否有效。

1. 在您的计算机上启动Avast 。
2. 选择应用程序右上角的菜单。^(Menu)

1. 选择设置^(Settings)。

1. 从左侧边栏中选择“通用^(General)” > “更新”。^(Update)

1. 在病毒定义^{(Virus definitions)}部分的右窗格中选择检查更新。^{(Check for Updates)}

1. 等待^(Wait)Avast找到新的病毒定义。

1. 在您的应用程序^{(Your application)}部分的右侧窗格中选择检查更新以将^{(Check for Updates )}Avast更新到最新版本。

如果Avast 应用程序^{(issue with the Avast app)}本身存在问题，将应用程序更新到最新版本应该可以解决该问题。

如果应用更新失败，您可能正在使用损坏的代理服务器和Avast。通过选择您的应用程序^{(Your application)}旁边的更多选项^{(More options)}并关闭使用特定代理服务器^{(Use specific proxy server)}框来禁用此代理服务器。然后，再次尝试更新应用程序。

修复 Avast 应用程序^{(Repair the Avast App)}

Avast防病毒软件的一个好处是它预装了一个修复选项。您可以运行此内置修复工具并让Avast自行修复。

1. 在您的计算机上访问Avast 。
2. 选择Avast 右上角的菜单。^(Menu)
3. 从菜单中选择设置。^(Settings)
4. 从左侧边栏中，选择常规^(General)>故障排除^{(Troubleshooting)}。

1. 向下滚动故障排除^{(Troubleshooting)}屏幕到仍有问题^{(Still having problems)}部分，然后选择修复应用程序^{(Repair App)}按钮。

1. 在打开的提示中选择是。^(Yes)

1. 修复Avast后重新启动计算机。

关闭 Windows 防火墙^{(Turn Off the Windows Firewall)}

您计算机的防火墙定义了传入和传出连接的工作方式。您的防火墙可能会阻止Avast与病毒定义服务器的连接。因此，Avast无法更新其病毒数据库。

^{(Disable the firewall)}按照以下步骤暂时禁用防火墙，然后查看Avast是否可以更新其病毒定义。

1. 打开控制面板^{(Open the Control Panel)}并选择系统和安全^{(System and Security)}。

1. 选择Windows Defender 防火墙^{(Windows Defender Firewall)}。

1. 从左侧边栏中选择打开或关闭 Windows Defender 防火墙。^{(Turn Windows Defender Firewall on or off)}

1. 在专用网络设置^{(Private network settings)}和公共网络设置^{(Public network settings)}部分中启用关闭 Windows Defender 防火墙^{(Turn off Windows Defender Firewall)}选项。选择底部的确定。^(OK)

1. 启动Avast并运行手动病毒定义更新。

修复您的日期和时间设置^{(Fix Your Date and Time Settings)}

^(Certain)如果您在计算机上设置了错误的日期和时间设置，^{(wrong date and time settings)}某些应用程序将无法正常运行。这可能是Avast在更新其病毒定义时遇到问题的原因。

幸运的是，在Windows 10^{(Windows 10)} PC上解决此问题很容易。

1. 同时按Windows + I键打开 Windows 10 的设置应用程序。^(Settings)
2. 在设置中选择时间和语言。^{(Time & Language)}

1. 在左侧边栏中选择日期和时间。^{(Date & time)}
2. 在右侧窗格中，启用自动设置时间和自动^{(Set time automatically)}设置时区^{(Set time zone automatically)}选项。

重置 Avast 设置^{(Reset Avast Settings)}

Avast内置了各种工具和设置选项。任何不正确的配置都可能导致应用出现问题，从而阻止应用获取新的病毒定义。

幸运的是，Avast提供了一个选项，可以将所有选项快速重置为默认值。请记住，当您重置Avast^(Avast)时，您必须重新配置您的选项。

1. 打开Avast并选择右上角的菜单。^(Menu)
2. 从菜单选项中选择设置。^(Settings)
3. 从左侧边栏中选择常规^(General)>故障排除。^{(Troubleshooting)}
4. 向下滚动故障排除^{(Troubleshooting)}页面到重置所有设置^{(Reset all settings)}部分。在这里，选择重置为默认值^{(Reset to Default)}按钮。

1. 在提示中选择是，重置。^{(Yes, Reset)}

1. 在Avast^(Avast)中运行手动病毒定义更新。

重新安装 Avast^{(Reinstall Avast)}

如果Avast仍然没有更新病毒定义，您应该卸载并重新安装该应用程序^{(uninstall and reinstall the app)}以查看是否可以解决问题。重新安装应用程序为应用程序提供了构建其配置的新机会。

1. 在您的 PC 上打开“设置”^(Settings)应用。
2. 选择应用程序^(Apps)，然后在应用程序列表中选择Avast 。
3. 选择 Avast 的卸载^(Uninstall)按钮。

1. 在打开的提示中选择卸载。^(Uninstall)

1. 卸载Avast 后^(Avast)重新启动 PC 。
2. 在Avast 网站^{(Avast website)}上重新下载该应用程序并将其安装到您的 PC 上。

联系 Avast^{(Contact Avast)}

如果Avast^(Avast)存在重大问题，请使用Avast 支持站点^{(Avast support site)}联系防病毒开发人员。如果您无法使用上面列出的方法解决问题，则值得使用此选项。

1. 在您的计算机上打开 Web 浏览器并访问Avast 支持站点^{(Avast support site)}。
2. 向下滚动^(Scroll)站点并选择“联系我们”^{(Contact Us)}按钮。
3. 在您的屏幕上选择适当的选项，您应该能够与Avast的某个人联系。

我们希望本指南在 Avast 不更新病毒定义时帮助您修复它。但是，如果您的问题仍未解决，请考虑使用 Windows 10 PC 上的内置Microsoft Defender 防病毒软件^{(Microsoft Defender Antivirus)}扫描您的计算机。^{(scanning your computer)}

Avast Not Updating Virus Definitions? 8 Quick Fixes

If you use Avast as your primary antivirus tool and it doesn’t updatе its vіrus definitions, you risk getting your computer infected with various kinds of viruses and malware. This security breach is a serious problem that requires an immediate fix.

Some of the common reasons Avast won’t update its virus definitions could be that your firewall is blocking the connection, you have the wrong date and time set on your computer, or there’s an issue with the Avast app itself.

Check Your Internet Connection

Avast needs to connect to the internet to download new virus definitions. If your internet connection is inactive or unreliable, Avast could experience problems with getting new virus updates.

To check your internet connection, open a web browser on your computer and try to access a website like Google. If the site loads fine, your internet is working as it should.

If the site fails to load, there might be an issue with your connection. You can either try to fix the problem yourself or contact your internet service provider (ISP).

Manually Update Avast Virus Definitions and the Avast App

Avast allows you to download virus definitions both manually and automatically. Whether you perform a manual or an automatic update, Avast will download the same set of virus definitions.

You should also keep the Avast app updated as newer app updates bring improvements and fix existing bugs.

If the automatic updates have stopped working, you can run a manual update and see if that works by following the steps below.

1. Launch Avast on your computer.
2. Select Menu at the top-right corner of the app.

1. Select Settings.

1. Choose General > Update from the left sidebar.

1. Select Check for Updates in the right pane in the Virus definitions section.

1. Wait for Avast to find new virus definitions.

1. Select Check for Updates on the right pane in the Your application section to update Avast to the latest version.

If there’s an issue with the Avast app itself, updating the app to the latest version should likely fix that.

In case the app update fails, you might be using a broken proxy server with Avast. Disable this proxy server by selecting More options next to Your application and turning off the Use specific proxy server box. Then, try updating the app again.

Repair the Avast App

A good thing about Avast antivirus is that it comes preloaded with a repair option. You can run this built-in repair tool and let Avast repair itself.

1. Access Avast on your computer.
2. Select Menu at the top-right corner of Avast.
3. Choose Settings from the menu.
4. From the left sidebar, choose General > Troubleshooting.

1. Scroll down the Troubleshooting screen to the Still having problems section and select the Repair App button.

1. Choose Yes in the prompt that opens.

1. Restart your computer when Avast is repaired.

Turn Off the Windows Firewall

Your computer’s firewall defines how the incoming and outgoing connections work. Your firewall may be blocking Avast’s connection to the virus definition servers. As a result, Avast is unable to update its virus database.

Disable the firewall temporarily by following the steps below, and see if Avast can then update its virus definitions.

1. Open the Control Panel and select System and Security.

1. Choose Windows Defender Firewall.

1. Select Turn Windows Defender Firewall on or off from the left sidebar.

1. Enable the Turn off Windows Defender Firewall option in both Private network settings and Public network settings sections. Select OK at the bottom.

1. Launch Avast and run a manual virus definition update.

Fix Your Date and Time Settings

Certain apps don’t work as usual if you have the wrong date and time settings set on your computer. This might be a reason Avast has issues updating its virus definitions.

Luckily, fixing this issue on a Windows 10 PC is easy.

1. Open Windows 10’s Settings app by pressing Windows + I keys simultaneously.
2. Select Time & Language in Settings.

1. Choose Date & time in the left sidebar.
2. On the right pane, enable both Set time automatically and Set time zone automatically options.

Reset Avast Settings

Avast comes with various tools and setting options built into it. Any incorrect configuration can cause issues with the app, preventing the app from getting new virus definitions.

Luckily, Avast offers an option to reset all options back to their default values quickly. Keep in mind that you’ll have to reconfigure your options when you have reset Avast.

1. Open Avast and select Menu at the top-right corner.
2. Choose Settings from the Menu options.
3. Select General > Troubleshooting from the left sidebar.
4. Scroll down the Troubleshooting page to the Reset all settings section. Here, select the Reset to Default button.

1. Select Yes, Reset in the prompt.

1. Run a manual virus definitions update in Avast.

Reinstall Avast

If Avast still doesn’t update the virus definitions, you should uninstall and reinstall the app to see if that fixes the problem. Reinstalling the app gives the app a fresh chance to build its configuration.

1. Open the Settings app on your PC.
2. Select Apps and then choose Avast in the apps list.
3. Select the Uninstall button for Avast.

1. Choose Uninstall in the prompt that opens.

1. Restart your PC when you’ve uninstalled Avast.
2. Redownload the app on the Avast website and install it on your PC.

Contact Avast

If there’s a major issue with Avast, contact the antivirus developer using the Avast support site. It’s worth using this option if you can’t fix the problem with the methods listed above.

1. Open a web browser on your computer and access the Avast support site.
2. Scroll down the site and select the Contact Us button.
3. Select appropriate options on your screen, and you should be able to connect with someone at Avast.

We hope this guide helped you fix Avast when it doesn’t update the virus definitions. However, consider scanning your computer with the built-in Microsoft Defender Antivirus on your Windows 10 PC if your issue remains unresolved.

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