What Is The wuauclt.exe File?

The wuauclt.exe file is not a virus. It's a regular Windows application that runs the Windows Update AutoUpdate Client. However, some viruses and malware try to conceal themselves by running under the name wuauclt.exe, which is visible in the Process List in Windows Task Manager. Use antivirus to diagnose.

Genuine wuauclt.exe is used to automatically download system security updates, that are issued by Microsoft on the second Tuesday of every month.