Malicious software often uses the name wuauclt.exe to hide. If the file is located anywhere other than C:\Windows\System32 , it is likely a virus.
( wuauclt.exe )
On the third retry, a second issue occurs: The Windows Module Installer service (TrustedInstaller) is stuck in a "stopping" state from a failed update three months ago. When WUAUCLT asks TrustedInstaller for permission to overwrite the files, TrustedInstaller doesn't answer.
If wuauclt crashes after this, run:
Open File Explorer and navigate to: C:\Windows\SoftwareDistribution .