What is wuauclt1.exe?

The genuine wuauclt1.exe file is a software component of Microsoft Windows Operating System by Microsoft. Wuauclt1.exe is an executable file that is part of the Windows Update AutoUpdate Client. Wuauclt.exe is a core Windows file and should not be removed but it is quite normal to find a duplicate version of the file called, "wuauclt1.exe" in the "%windows%\System32" folder. Windows Update is included in every version of the Windows operating system since Windows 98. Windows updates differ from Microsoft updates as Windows updates specifically provide fixes for the operating system and its components, whereas Microsoft updates offer fixes for several Microsoft products, including Microsoft office, Windows Live Essentials and Microsoft Expression Studio. New security releases are routinely released on the second Tuesday of every month, called, 'Patch Tuesday'. Microsoft, founded by Bill Gates and Paul Allen in 1975, is the world's largest software maker with respect to revenue. Microsoft is best known for Windows. The company quickly rose to fame and fortune following the success of its 1986 public share offering turning three people into billionaires and an estimated 12,000 Microsoft employees into millionaires.

WUAUClt1 stands for Windows Update AutoUpdate Client 1

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 wuauclt1.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 wuauclt1.exe related errors

Wuauclt1.exe file information

The process known as Windows Update AutoUpdate Client belongs to software Microsoft Windows Operating System by Microsoft (

Description: Wuauclt1.exe is not essential for Windows and will often cause problems. Wuauclt1.exe is located in the C:\Windows\System32 folder. The file size on Windows 8/7/XP is 172,312 bytes. 
The file has a digital signature. The program has no visible window. Wuauclt1.exe is able to record keyboard and mouse inputs. Therefore the technical security rating is 54% dangerous, however you should also read the user reviews.

Recommended: Identify wuauclt1.exe related errors

Important: Some malware disguises itself as wuauclt1.exe, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the wuauclt1.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.


User Comments

wuauclt1.exe is the result of updating to Windows Updater to V5 !
If located in %System%\wuauclt1.exe or %System%\dllcache\wuauclt1.exe then most probably a malware.
  Elena   (further information)

Summary: Average user rating of wuauclt1.exe: based on 2 votes with 2 user comments. One user thinks wuauclt1.exe is essential for Windows or an installed application. One user suspects danger.

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Best practices for resolving wuauclt1 issues

A clean and tidy computer is the key requirement for avoiding problems with wuauclt1. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic 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 resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off doing a repair of your installation, or in the case of Windows 8, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the wuauclt1.exe process on your computer, the following programs have proven to be helpful: Security 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. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

wuauclt1.exe [all]