Instup.exe是一个可执行文件，当您在计算机上安装(Instup.exe)Avast防病毒软件时，它会与其他文件一起下载。它是病毒扫描软件的一个非常重要的组件。如果没有 instup.exe，您可能无法在您的计算机上更新Avast 。然而，尽管是合法文件，但已知 instup.exe 会导致Windows设备出现性能问题。
例如，一些 Avast 用户(some Avast users)报告说，instup.exe 有时会消耗高达 100% 的CPU资源，从而导致其他应用程序无法使用。如果这描述了您的困境，我们将向您展示如何解决问题并防止文件影响您的 PC 性能。
什么是 Instup.exe？
“ Avast Antivirus Installer”是instup.exe程序文件的官方文件描述。在您的计算机上安装Avast Antivirus时，instup.exe 可确保一切顺利。还有更多：可执行文件还确保Avast在您的设备上使用最新的病毒定义保持最新状态。
注意：(Note:) 病毒(Virus)定义（或病毒签名）描述了帮助安全软件检测计算机上的病毒和恶意软件的文件。
总之，instup.exe 处理防病毒软件的安装，还有助于更新应用程序的病毒定义。将程序文件视为Avast(Think)的安装和更新助手。
在其自然状态下，instup.exe 是一个没有问题的程序，不会占用系统资源。它只在必要时在后台运行——安装病毒定义和软件更新。
虽然 Avast 的软件更新偶尔会推出，但病毒定义更新的安装是日常操作。这些更新的频率没有官方消息，但一些消息来源(some sources)称Avast每天更新其病毒定义超过 100 次。
这可能是真的，因为该公司使用“流式更新”技术(“Streaming Update” technology)在用户发现新威胁时立即将更新推送给用户。所以是的，Avast每天在后台运行多个更新。
通过扩展，instup.exe 还将每天在后台运行多次。这就解释了为什么您可能经常在任务管理器(Task Manager)中发现程序文件处于活动状态。
Instup.exe 安全吗？
默认情况下，安装病毒定义或软件更新后，instup.exe 应自动停止运行。如果程序文件在后台保持活动状态，则说明某处存在问题。有两种可能性需要考虑：
1. Avast防病毒软件出现故障。
2.恶意程序或特洛伊木马正在伪装正版 instup.exe。
在下一部分中，您将了解如何确定您 PC 上的 instup.exe 程序文件是真实的还是恶意的。
Instup.exe 是正版的(Instup.exe Genuine)吗？还是病毒(Virus)？
您可以通过检查其位置以及其数字签名来推断程序文件的真实性。就是这样：
1. 启动任务管理器并在(Task Manager)详细信息(Details)选项卡中找到 instup.exe 。
2. 右键单击任务管理器中的instup.exe，然后选择打开文件位置(Open file location)。
您可能会发现该进程的多个实例正在运行；右键单击任何继续。但请注意，您应该对任务管理器(Task Manager)中的所有实例重复这些步骤。您永远无法分辨其中哪一个是伪装成正版 instup.exe 程序文件的病毒。
3. 检查文件资源管理器的地址栏并确保文件位于此文件夹中：C:\Program Files\Avast Software\Avast\setup
如果该文件位于您 PC 上的此文件夹之外，则很可能是恶意副本。继续下一步以检查文件的数字签名。这将有助于确认您 PC 上 instup.exe 文件的合法性。
3. 右键单击 instup.exe 并选择属性(Properties)。您可以从任务管理器(Task Manager)中获得相同的结果；右键单击该进程并选择Properties。
4. 转到数字签名(Digital Signatures)选项卡并检查签名者姓名(Name of signer)列；它应该是Avast Software sro。
如果Avast不是文件的数字签名者，则它是恶意副本。您应该立即从计算机中删除该文件。更好(Better)的是，通过病毒或恶意软件扫描程序运行文件（最好是不同的防病毒工具，而不是Avast）。
修复 Instup.exe 高 CPU 使用率
如果您确定Avast Antivirus 安装程序(Avast Antivirus Installer)不是恶意软件，但程序文件不断在后台运行，请按照以下故障排除技术阻止 instup.exe 耗尽您的 PC 资源。
1. 强制停止 instup.exe(1. Force-Stop instup.exe)
只需在(Simply)任务管理器(Task Manager)中结束进程即可解决问题。前往任务管理器(Task Manager)的详细信息(Details)选项卡，选择instup.exe，然后单击右下角的结束任务(End task)按钮。
2.重启你的电脑(2. Restart Your Computer)
如果进程自行重新启动并在后台无休止地运行，请重新启动计算机。之后(Afterward)，启动任务管理器(Task Manager)并监控情况。如果问题仍然存在，请转到(Move)下一个故障排除步骤。
3. 修复 Avast 软件(3. Repair the Avast Software)
Avast附带一个内置的故障排除工具，可修复导致软件故障的问题。如果Avast偶尔崩溃，或者某些组件无法正常工作，您可以启动自我修复。
启动Avast，单击菜单按钮，转到设置(Settings)>故障排除(Troubleshooting)，然后单击修复应用程序(Repair App)按钮。
修复操作可能需要几分钟时间，具体取决于您 PC 的硬件配置。修复后重新启动计算机，看看是否会阻止 instup.exe 在后台不间断运行。
4.暂时禁用自动更新(4. Temporarily Disable Automatic Updates)
(Instup.exe)如果安装更新时发生错误或更新出现问题，Instup.exe可能会一直潜伏在后台。Avast防病毒安装程序可能会不断重新尝试安装，从而导致磁盘使用率过高。
禁用 Avast 的自动更新并检查是否从任务管理器(Task Manager)中撤回了 instup.exe 。打开 Avast 的设置菜单，选择General，选择Update，然后在Virus Definitions和Application Update部分选择Manual update 。
重新启动计算机并检查是否稳定了 instup.exe 程序文件。
不得已：重新安装Avast或使用(Use)替代方案
如果 instup.exe 继续存在问题，请从您的 PC 中删除Avast 。请参阅我们关于在 Windows 10 上完全卸载 Avast(uninstalling Avast completely on Windows 10)的综合教程以了解更多信息。重新安装Avast应该会稳定 instup.exe 程序文件。但如果没有，请再次卸载Avast并使用其他强大的病毒扫描程序(other powerful virus scanners)来保护您的计算机。
What is instup.exe and Is it Safe?
Instup.еxe is an executable fіle that’s downloaded alongside other files when you install the Avast antivirus software on уour computer. It’s a very important component of the virus-scanning software. Without instup.exe, yoυ may not be able to update Avast on your computer. Desрite being a legitimate file, however, instup.exe is known to cause performance issues on Windows devices.
For example, some Avast users report that instup.exe sometimes consumes up to 100% of CPU resources, thereby rendering other apps unusable. If that describes your predicament, we’ll show you how to fix the problem and prevent the file from affecting your PC’s performance.
What Is Instup.exe?
“Avast Antivirus Installer” is the official file description of the instup.exe program file. When installing the Avast Antivirus on your computer, instup.exe makes sure everything goes smoothly. There’s more: The executable file also ensures that Avast stays up-to-date on your device with the latest virus definitions.
Note: Virus definitions (or virus signature) describe files that help a security software to detect viruses and malware on your computer.
Summarily, instup.exe handles the installation of the antivirus software and also helps to update the app’s virus definitions. Think of the program file as Avast’s installation and update assistant.
In its natural state, instup.exe is an unproblematic program that doesn’t hog system resources. It only runs in the background when necessary—to install virus definitions and software updates.
While Avast’s software updates are rolled out occasionally, the installation of virus definition updates is a daily operation. There’s no official word on the frequency of these updates but some sources quote that Avast updates its virus definitions more than 100 times a day.
That could be true, because the company uses a “Streaming Update” technology to push updates to users immediately when they discover new threats. So yes, Avast runs multiple updates in the background daily.
By extension, instup.exe will also run in the background multiple times daily. That explains why you may often find the program file active in Task Manager.
Is Instup.exe Safe?
By default, instup.exe should automatically stop running after installing virus definitions or software updates. If the program file stays active in the background, then there’s a problem somewhere. There are two possibilities to consider:
1. The Avast antivirus software is malfunctioning.
2. A malware program or Trojan Horse is camouflaging the genuine instup.exe.
In the next section, you’ll learn how to determine if the instup.exe program file on your PC is genuine or malicious.
Is Instup.exe Genuine? Or Is It a Virus?
You can deduce the authenticity of the program file by checking its location as well as its digital signature. Here’s how:
1. Launch the Task Manager and locate instup.exe in the Details tab.
2. Right-click on instup.exe in the Task Manager and select Open file location.
You may find multiple instances of the process running; right-click on any to proceed. But note that you should repeat the steps for all the instances in the Task Manager. You never can tell which one of them is a virus pretending to be a genuine instup.exe program file.
3. Check the File Explorer’s address bar and ensure the file is located in this folder: C:\Program Files\Avast Software\Avast\setup
If the file is outside this folder on your PC, it’s most likely a malicious copy. Proceed to the next step to check the digital signature of the file. That’ll help confirm the legitimacy of the instup.exe file on your PC.
3. Right-click instup.exe and select Properties. You can achieve the same result from the Task Manager; right-click the process and select Properties.
4. Go to the Digital Signatures tab and check the Name of signer column; it should read Avast Software s.r.o.
If Avast isn’t the digital signer of the file, it’s a malicious copy. You should remove the file from your computer immediately. Better yet, run the file through a virus or malware scanner (preferably a different antivirus tool, not Avast).
Fix Instup.exe High CPU Usage
If you’ve established that the Avast Antivirus Installer isn’t malicious but the program file constantly runs in the background, follow the troubleshooting techniques below to stop instup.exe from draining your PC’s resources.
1. Force-Stop instup.exe
Simply ending the process in the Task Manager can resolve the problem. Head to the Task Manager’s Details tab, select instup.exe, and click the End task button at the bottom-right corner.
2. Restart Your Computer
If the process restarts itself and keeps running in the background endlessly, restart your computer. Afterward, launch the Task Manager and monitor the situation. Move to the next troubleshooting step if the problem continues.
3. Repair the Avast Software
Avast ships with a built-in troubleshooting tool that fixes issues causing the software to malfunction. If Avast occasionally crashes, or some components aren’t working correctly, you can initiate a self-repair.
Launch Avast, click the menu button, go to Settings > Troubleshooting and click the Repair App button.
The repair operation may take a couple of minutes, depending on your PC’s hardware configuration. Restart your computer after the repair and see if that stops instup.exe from running non-stop in the background.
4. Temporarily Disable Automatic Updates
Instup.exe may stay lurking in the background if an error occurs while installing an update, or if there’s a problem with an update. The Avast antivirus installer may keep reattempting the installation, thereby causing high disk usage.
Disable Avast’s automatic updates and check if that withdraws instup.exe from the Task Manager. Open Avast’s settings menu, select General, select Update, and then select Manual update in the Virus Definitions and Application Update sections.
Restart your computer and check if that stabilizes the instup.exe program file.
Last Resort: Reinstall Avast or Use an Alternative
Remove Avast from your PC if instup.exe continues its problematic spell. Refer to our comprehensive tutorial on uninstalling Avast completely on Windows 10 to learn more. Reinstalling Avast should stabilize the instup.exe program file. But if it doesn’t, uninstall Avast again and use other powerful virus scanners to protect your computer.
