I learned that the anti-virus application bundled with SMP 9 is called Authentium. Iolo's instructions for a "complete removal" of SMP includes using a program called Windows Installer Clean Up to scrub your hard drive of any residual files. Until I deleted AVSDK5 using the the Windows Installer Clean Up I could not re-install SMP 9.
Once I deleted AVSDK5 the re-install went smoothly. Upon re-installing SMP 0 the AVSDK5 product was back on my machine.