Hi Evan,
>I wondering if something can be done with WSH or using WISE. My launcher app would detect if a service pack was needed, then install it. Thinking as I write this... the launcher app couldn't be VFP since the runtime couldn't be overwritten. Perhaps a plain C launcher...

That's a problem with setup routines, they can't update DLLs, etc. that are in use. Hence the Reboot after setup routine... A plain C launcher would work unless its libraries are in need of an update. <G> Hmm...