Thanks bigschwabbel. As it turned out I had to decrease the size of my disk volume.??? I'm not sure why but it worked. I did a third seach within the support community and found this information in a thread entitled: "while installing mountain lion I am getting: This disk cannot be used to start your computer" I'm installing Maverick however this users problem gave the same error message. So I decided to try the solution they received (reduce the disk volume). Happily it worked!
It is clear to all that I'm not a computer expert. In fact I'm barely a novice. However it seems reasonable to me that Apple might have mentioned this in the directions for upgrading from Snow Leopard to Maverick. Such a problem as I had, adjusting drive volume for installation, is a big deal for a person like myself who hasn't the background to intuitively know this. For that matter, maybe dealing with this potential problem should be built into the Maverick OS installation download. I should add that once this fix allowed the OS to install everything went perfectly so kudos to Apple for that.