A family of Microsoft relational database management systems designed for ease of use.
Back again with more information for those who might read this later. I've discovered another thing about "msi" problems. Apparently the "msiexec" file can become "fragmented" and won't work until you (or in my case, my users) have defragmented your computer.
Defragging is always a good thing to do on a fairly regular basis, but it's just one more solution to the problem of working with Access Runtime and the msiexec.
Happy computing!