Verify file integrity. If the crash originates from a non-system location, the "best" fix is a full antivirus scan, not a Windows repair.
sfc /scannow
If TrustedInstaller or SYSTEM lacks access to HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate , the client throws an unhandled exception. Why Does Wuauclt.exe Crash BEST
Since wuauclt.exe crashes often trace back to disk corruption (bad sectors in the database folder), the "best" long-term solution is monitoring S.M.A.R.T. attributes. Use PowerShell: Verify file integrity