Well, after much time and analysis I have solved the issue. I repetitively attempted install after install without much luck. I then for no real reason updated my PHP to the latest Ver. At the same time I increased the memory limit in PHP to 64M. Installs continued to crash with "Concrete must be installed in an empty database. I cannot say how many times I had to drop all tables in the database. I realized that the problem appeared to relate to an Activity timeout in PHP, because as I increased the timeout from 70 Sec (default) to 120, the database increased its table size. Finally with the PHP timeout set to 350!! seconds...the database table install completed and the install finalized without further problems. I cannot say exactly where the problem is in the install script however it appears that on timeout the install goes back, looks at the database and signals it as being occupied. PROBLEM SOLVED!