New Post: Installed updates continue to want to be installed

isinstalled:

<msiar:MsiProductInstalled ProductCode="{57bda5c6-443c-4d65-b233-2823932170ff}"/>

isinstallable:

<lar:Not>
<msiar:MsiProductInstalled ProductCode="{57bda5c6-443c-4d65-b233-2823932170ff}"/>
</lar:Not>