修正 Avast 不更新病毒定義的問題

Avast is one of the most commonly used antivirus software available on the internet. It is known for the best protection service for all devices connected to the internet. Since it is free-to-use software, many people rely on this software for antivirus protection. Yet, like all apps and games, Avast is not without errors and problems. Many users report Avast not updating virus definitions issue which causes a major security breach on your PC. If you are also facing the same problem on your device, the troubleshooting methods discussed in this guide will help you fix the issue.

How to Fix Avast Not Updating Virus Definitions

Here are a few common reasons that cause Avast antivirus not updating virus definitions issues on your computer. Analyze them deeper so you will get an idea of how to resolve the same.

• Any temporary glitches in your PC that are preventing Avast from updating the software and its components.
• You are running Avast with administrative rights. This prevents a few features from being accessed on your computer.
• Outdated Avast will cause the discussed problem.
• Few essential services like the aswbIDSAgent are disabled on your computer.
• The Avast installed on your PC is corrupt or misconfigured.
• Your PC is infected with malware or virus.
• Some background tasks are interfering with your program.
• 過時的 Windows 作業系統。
• Firewall is preventing Avast to open.
• Corrupt or incompatible installation files of Avast.
• Inappropriate date and time settings on your computer.

Now, move ahead to the next section to find the effective troubleshooting methods to fix Avast virus definitions won’t update issue.

Here are some effective troubleshooting methods that will help you fix Avast not updating virus definitions issue on your Windows 10 computer. Read them carefully before you implement them.

方法1： 重啟電腦

Before trying all the listed advanced troubleshooting methods, you are advised to reboot your computer. When you restart your computer, the technical glitches that cause any challenging layouts will be resolved thereby helping you to fix Avast not updating virus definitions issue. You can also 關閉 the PC using the Power options and turn it on again after some time.

1。 導航 Start menü.

2.現在，選擇 電源圖標 在屏幕的左下角。

3. 幾個選項如 寵物床, 關閉和 重新啟動 將顯示。在這裡，點擊 重新啟動.

Once you have restarted your computer, check if you can open Avast without any issues.

Method 2: Run Avast with Admin Privilege

You need administrative privileges to access a few features and services in Avast. If you do not have the required administrative rights, you might face Avast antivirus not updating virus definitions issue. However, few users have suggested that the problem can be resolved when running the program as an administrator.

1。 右鍵單擊 Avast的 防病毒圖標 在桌面上。

2。 現在，點擊 氟化鈉性能.

3. 在「屬性」視窗中，切換到 相容性 標籤。

4. Here, check the box 以管理員身份運行此程序.

5.最後，點擊 申請>確定 保存更改。

Now, relaunch the program to see if Avast functions now without any problems.

相關閱讀： Fix Virus Definition Failed in Avast Antivirus

方法 3：更改日期和時間設定

Incorrect date and time settings in your computer may contribute to Avast not updating virus definitions issue on Windows PC. To sync the date, region, and time settings in your Windows 10 computer follow the below-listed instructions.

1。 按 Windows + I鍵 一起開 視窗設置。

2.現在，選擇 時間和語言 設置。

3. 接下來，在 約會時間 選項卡，確保兩個值 自動設定時間 和 自動設置時區 選項已開啟。

4.然後，點擊 立即同步 as highlighted above. Check if the Virus Definitions Update Failed issue is resolved or not.

Method 4: Update Avast Antivirus

If there are any bugs within Avast, you can fix them by updating the app. As mentioned earlier, Avast gets regular updates to fix all the errors and bugs. When these bugs and errors come to the developer’s eye, they release updates to fix them completely. Follow the below-mentioned steps to update Avast app to fix Avast antivirus not updating virus definitions issue.

1.點擊 Windows鍵 和類型 Avast的免費殺毒軟件。 點擊 已提交 從搜索結果。

2。 去 選項 icon from the top right corner of the Avast user interface.

3. 然後，選擇 設定 從名單。

4. 現在，切換到 更新消息 標籤並點擊 檢查更新 button. Make sure you get the following messages.

• 病毒定義是最新的
• Avast Free Antivirus is up to date

5. Once you have updated it, restart Avast的 and check if the issue has been solved.

相關閱讀： How to Fix Avast Update Stuck on Windows 10

方法二：關閉後台程序

If you are still worried about Avast not updating virus definitions issue, it can be resolved by closing all the background tasks running on your PC. Several background tasks on your PC will interfere with Avast, thereby preventing the app from being opened. Hence, close all the background tasks on your PC by following our guide How to End Task in Windows 10, and proceed as instructed.

Once you have closed all the background processes, check if you were able to work with Avast on your computer without any issues.

Method 6: Enable aswbIDSAgent Service Settings

Several users have reported that the bug causing Avast virus definitions won’t update issue can be fixed by making some changes in the aswbIDSAgent Service. This method is very easy and you can implement the same by following the below-mentioned steps.

1。 按 Windows鍵，輸入 服務，然後點擊 以管理員身份運行.

2. 現在，向下捲動並雙擊 aswbIDSAgent 服務。

3. Now, in the new pop-up window, change “啟動類型” to Automatic, as depicted.

注意： 如果 服務狀態 is 停止，然後點擊 開始 按鈕。 如果 服務狀態 is 運行， 點擊 停止 並重新開始。

4. When you start the service, you may face a 1079 error (or something similar to that). In this case, switch to the 登錄“ 選項卡，單擊 此帳戶 radio button and select the 瀏覽 選項。

5。 在裡面 輸入對象名稱來選擇 field, type the username of your account.

6.然後，點擊 檢查名稱 option to authenticate the object name.

7。 現在，點擊 OK to save the changes and if you are prompted, type in your administrator account.

8。 點擊 申請>確定 to save the changes and check if you were able to open Avast without any issues.

相關閱讀： 如何從 Windows 10 移除 Avast

方法 7：執行病毒掃描

There are few circumstances where a virus or malware in your computer is taking over the control of Avast. Hence, you must check whether the third-party harmful viruses are interfering with Avast, causing Avast not updating virus definitions issue.

Several Microsoft experts suggest that scanning a PC will help you maintain your computer threat free. If there are any viruses or malware intrusions on your PC, you cannot use external and internal hardware devices.

因此，建議您按照我們的指南中的說明掃描您的電腦如何在我的電腦上執行病毒掃描？

另外，如果您想從電腦中移除惡意軟體，請查看我們的指南如何在 Windows 10 中從您的電腦中移除惡意軟體。

方法 8：更新 Windows

Also, if there are any bugs in your PC, they can only be fixed after a Windows update. Microsoft releases regular updates to fix all these bugs thereby troubleshooting Avast not updating virus definitions issues.

Hence, ensure if you have updated your Windows Operating System and if any updates are pending in action, use our guide How to Download and Install Windows 10 Latest Update

After updating your Windows Operating System, check whether you can access your Avast without any issues.

方法 9：修改 Windows Defender 防火牆設置

Still, if you cannot fix Avast not updating virus definitions issue, this may be due to an over-reactive or over-protective firewall suite in your Windows 10 computer. This prevents the connection link between the app launcher and the server. So, to fix this problem, you can whitelist Avast in your Firewall settings or disable the problem temporarily.

Option I: Whitelist Avast Antivirus

To allow Avast in your Windows Defender Firewall, follow our guide Allow or Block Apps through the Windows Firewall and implement the steps as instructed.

選項二：停用防火牆（不建議）

You can also disable Windows Defender Firewall, and to do so, check our guide on How to Disable Windows 10 Firewall and follow as instructed.

選項 III：在防火牆中建立新規則

1。 去 搜索菜單 和類型 具有進階安全性的 Windows Defender 防火牆。 然後，點擊 以管理員身份運行.

2. 現在，在左側窗格中，按一下 入境規則 如圖所示。

3. 然後，在右側窗格中按一下 新規則... 如圖所示。

4. 現在，請確保選擇 程序 選項下 您想要建立什麼類型的規則？ 菜單並單擊 下一個> 如圖所示。

5.然後，單擊 瀏覽... 按鈕對應 本程式路徑： 如圖所示。

6. 然後，導航至 C:Program Files (x86)Avast 路徑並雙擊 格局 file. Then, click on 已提交 按鈕。

注意： This location may vary according to the directory from which you have installed Avast. Browser the location accordingly.

7.然後，點擊 下一頁> ，在 新建入站規則嚮導 視窗如圖所示。

8. 現在，選擇旁邊的單選按鈕 允許連接 並點擊 下一頁> 如圖所示。

9.確定 域、私有和公有 框被選中並單擊 下一頁> 如圖所示。

10. 最後，為新規則新增名稱並按一下 完.

All done! Check if you can open Avast without any issues or not.

Method 10: Repair Avast Antivirus

If the above-listed solutions do not help you fix Avast antivirus not updating virus definitions issue, you can try repairing the app to fix all the harmful bugs within the app. This also fixes the corrupt installation files and even if this method fails to work, you can reinstall the app as instructed in the next method.

Option 1: Through Avast Antivirus Settings

1。 發射 Avast的 Antivirus and navigate to 菜單 > 設置 就像你之前做的那樣。

2.接下來切換到 疑難排除 標籤。

3. 在這裡，點擊 維修應用 in the right pane. Wait until the repairing process is complete. This might take a while.

注意： Avoid closing any windows or tabs during the repair process.

4. Once the repair is complete, reboot your PC. Check if the Avast virus definitions won’t update issue is fixed or not.

Option 2: Through Add or Remove Programs

1。 類型 添加或刪除程序 ，在 Windows搜索 box. Launch it from the search result, as shown.

2。 在 搜索此列表 酒吧，類型 Avast的.

3.然後，點擊 Avast的 然後， 修改.

注意： The below image is depicted for reference. Follow the same for Avast.

4。 點擊 修復 in the Avast pop-up window and follow the on-screen instructions.

Wait for it to be repaired. Restart your Windows 10 PC and check if the issue is resolved or not.

相關閱讀： Fix SearchUI.exe Suspended Error on Windows 10

Method 11: Reset Avast Settings

You can reset Avast settings on your Windows 10 PC to fix Avast not updating virus definitions issue. This will resolve all the incorrect configuration settings without the app, helping you to resolve the problem at ease.

注意： Resetting Avast will reset all the options and features of the app to their default values. You have to re-configure these options again once you open the app after the reset.

1。 發射 Avast的 並點擊 選項 屏幕右上角的選項。

2.現在，選擇 設定 從下拉列表中選擇。

3. 然後，導航至 總 tab and then select click on 疑難排除 選項。

4. 然後，選擇 重置為默認 按鈕。

5. If you are prompted, click on 是 and proceed with the on-screen instructions. Check if you have fixed Avast antivirus not updating virus definitions issue or not.

Method 12: Reinstall Avast in Safe Mode

If repairing Avast, still does not solve Avast virus definitions won’t update issue, you may have to reinstall the app in safe mode to fix the same. When you clean install Avast, the faulty application along with cache files, and corrupt registries will be fixed.

請瀏覽 Avast official uninstaller site, and then, click on avastclear.exe to get the Avast Uninstall Utility, as shown below.

Now you have to boot Windows in Safe Mode by following steps:

1。 類型 Windows 系統配置 in the Windows search bar. Then, click on 系統配置 推出它。

2。 切換到 船 tab in the window that opens.

3.接下來，選擇 安全啟動 under Boot options and then, click on OK， 如下所示。

4. Restart the computer and the computer will boot into Safe Mode.

5. Once Windows 10 is open in Safe Mode, click on downloaded Avast Uninstall Utility 你之前下載的。

6. In the uninstall utility window, ensure that the correct folder containing the corrupt Avast program is selected.

7。 現在，點擊 卸載.

8. After Avast has been uninstalled, 重新啟動 窗戶在 正常模式.

9. Visit this official Avast link 然後點擊 下載免費保護 to download the latest Avast Antivirus application, as shown below.

10. Once the file is downloaded, do to 我的下載， 雙擊 Setup file, and follow the on-screen instructions to install Avast.

Now when you launch the Avast program, you will not face Virus Definitions won’t update issue again.

相關閱讀： 如何在 Windows 10 中解除安裝 McAfee LiveSafe

Method 13: Contact Avast Support

If there are any major issues with Avast even after reinstalling the software, you can seek help from the Avast support site. This is a worth trying option to get rid of Avast not updating virus definitions issue. Follow the below-mentioned steps to contact the Avast support site.

1. Launch your favorite browser and visit the official Avast help center.

2. Now, scroll down the screen and click on 聯絡我們 按鈕。

3. Then, report your issue by following the on-screen instructions, and now, you could connect to an Avast professional to fix Avast antivirus not updating virus definitions problem.

常見問題（FAQ）

Q1. Why does my Avast not updating virus definitions?

答。 如果有的話 incompatibility issues in your PC, your Avast will not update new settings. If your Avast does not update this feature for you, make sure you check your firewall settings or repair the software if necessary.

Q2. Does Avast cause problems with Windows 10?

答。 In some circumstances, Avast might interfere with the pre-installed apps of your PC and causes Windows 10 to crash, freeze, consume more resources, display Blue Screen Error (BSOD), and a lot more. This might occur due to some incompatible programs you run manually or a few automatic services running in the background when you boot your Windows.

Q3. Why is my Avast browser not opening?

答。 If the Avast browser does not open on your Windows 10 PC, it may be because it is outdated or not updated properly。 很少 corrupt files within the app also cause the problem. Browser cache, cookies, and corrupt data also prevent Avast from being opened in the browser.

Q4. Is Windows Defender better than Avast?

答。 更準確地說， Avast is better than Windows Defender Firewall. Few reports say that the detection rate for Windows Defender Firewall was 99.5 % while Avast detected 100% of malware and viruses. Avast also comes with advanced features that are not in Windows Defender Firewall.

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我們希望本指南對您有所幫助，並且您可以 fix Avast not updating virus definitions issue in your system. Let us know which method worked for you the best. Also, if you have any queries/suggestions regarding this article, then feel free to drop them in the comments section.