Yipee! My PC Problem is finally RESOLVED!
Both the SOURCE of the problem and the FIX (resolution) to it have been solved & performed. As others had suggested, I initially suspected the problem was perhaps the result of a recent upgrade installation of Windows Media Audio Codecs for 'dbPower Amp Music Converter', or possibly a corruption with my Mozilla 'Firefox Internet Browser Program'. In the meantime, Synthzone Member Bill (Abacus) contacted & advised me that neither of those things would typically cause the PC to completely turn itself off the way mine did. Bill suspected the problem instead, to be HARDWARE related, and possibly a corrputed or out of date Video Card driver instead, causing the Video Card itself to malfunction. Lo and behold, following the next incidence of my PC's freeze & crash syndrome, and then giving permission for my PC to report the crash incidence to Microsoft, Microsoft returned with a message saying my Video Card driver needed to be updated, and then automatically launched Windows Updater, presenting the latest Driver for my Video Card available on my PC's screen to download and install via Windows Updater. AFter running Windows Updater and installing the new driver, everything's working fine again. (knock on wood). Many thanks to EVERYONE here, but especially Bill (Abacus) and Mike Sutliff for their expertise and support. - Scott