What is wusa.exe?

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 wusa.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.

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Wusa.exe file information

The process known as Windows Update Standalone Installer belongs to software Microsoft Windows Operating System by Microsoft (

Description: The original wusa.exe is an important part of Windows and rarely causes problems. Wusa.exe is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 314,880 bytes (76% of all occurrences), 135,680 bytes, 305,664 bytes or 140,800 bytes. 
It is a Windows core system file. The wusa.exe file is a trustworthy file from Microsoft. Therefore the technical security rating is 0% dangerous.

Recommended: Identify wusa.exe related errors

If wusa.exe is located in a subfolder of C:\Windows, the security rating is 1% dangerous. The file size is 314,880 bytes. Wusa.exe is a Windows core system file. Wusa.exe is a Microsoft signed file. The program has no visible window.

Important: Some malware disguises itself as wusa.exe, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the wusa.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 wusa issues

A clean and tidy computer is the key requirement for avoiding problems with wusa. 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 wusa.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

wusa.exe [all]