What is instup.exe?

The genuine instup.exe file is a software component of Avast Free Antivirus by AVAST.
Avast Free Antivirus is a freeware security program that protects computers against malware, viruses, trojans and computer worms. Instup.exe runs the installer and virus definition updater for Avast Free Antivirus. This is not an essential Windows process and can be disabled if known to create problems. Avast Free Antivirus is a freeware security solution available only for non-commercial or home use. The program offers an antivirus program with antispyware, antiphishing, anti-malware, automatic updates, HTTPS scanning, a Home Network Security scanner, DeepScreen, and much more. The program is available for the Microsoft Windows, Mac OS and Android platforms. AVAST Software is a Czech company that develops Internet security software products. The company was originally founded as ALWIL Software by Pavel Baudiš and Eduard Kučera in 1988 after they had tackled the Vienna virus. Avast Antivirus is currently one of the most popular and top-rated security applications available on the market. AVAST Software is based in Prague, Czech Republic.

InstUp stands for Avast Antivirus Installer and Virus Definition Updater

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the instup.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

Click to Run a Free Scan for instup.exe related errors

Instup.exe file information

The process known as Avast Antivirus Installer belongs to software Avast Free Antivirus or AVAST Software a.s or Avast Pro Antivirus by AVAST Software ( or Avast Software s.r.o.

Description: Instup.exe is not essential for the Windows OS and causes relatively few problems. Instup.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 597,824 bytes (25% of all occurrences), 598,336 bytes and 8 more variants. 
The file is certified by a trustworthy company. Instup.exe is not a Windows system file. The program has no visible window. Instup.exe is able to monitor applications. Therefore the technical security rating is 32% dangerous.

Uninstalling this variant: In case of problems with instup.exe, you can do the following:

Recommended: Identify instup.exe related errors

If instup.exe is located in a subfolder of Windows folder for temporary files, the security rating is 52% dangerous. The file size is 891,624 bytes (33% of all occurrences), 649,312 bytes, 1,307,416 bytes or 761,600 bytes. Instup.exe is certified by a trustworthy company. The file is not a Windows system file. The program has no visible window. Instup.exe is able to monitor applications.

Uninstalling this variant: In case of problems with instup.exe, you can do the following:
  • ask the software vendor,, for advice
  • uninstall the program using the Control Panel ⇒ Uninstall a ProgramAVAST Software s.r.o. or AVAST Software a.s.

Important: Some malware camouflages itself as instup.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the instup.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


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Best practices for resolving instup issues

A clean and tidy computer is the key requirement for avoiding problems with instup. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the instup.exe process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

instup.exe [all]