Windows Updates repeat

Have a PC that repeatedly install same updates over and over.  To fix:

As an administrator, stop the Windows Update service (Start > Run > services.msc, stop Windows Update). Rename the Windows\SoftwareDistribution directory to something like SoftwareDistribution.bak and restart.

Occasionally I've seen updates become "stuck" and cached, prompting the behavior you're seeing. This method normally works for me in most cases.