False alarm for Support Assist... I was able to duplicate the bad behavior without Support Assist installed. Another install from another vendor exhausted memory. I will continue to investigate the problem searching for a root cause. A Windows UI component, 'dwm.exe', "Desktop Windows Manager" was responsible for the memory exhaustion, both times, during the installs from different vendors.
My desktop PC: XPS8940, 8GB memory, single platter drive, 1TB. Support Assist version:  V3.10.4 All system memory used up.   The desktop PC slows to a crawl. Was able to update BIOS and drivers successfully after multiple tries, so all up to date. Apparently Support Assist is failing to install a subsystem over and over.   I saw failed to install "Support Assist OS Recovery" multiple times. Does Support Assist have a log file I can review? Note: I divided the main disk into two logical drives C: & G: My solution to this problem was to uninstall Support Assist, Dell Update, etc...  in order to have a usable PC. Obviously, this is not a sustainable solution. Is there a way to run Support Assist without the program attempting to install a subsystem first? Should I just run Dell Update instead?   All I need is a way to update Dell provided drivers and BIOS. Thanks.
Support Assist Breaks System