Thank you, Guilty Spark. I just now downloaded RKill (ver. 22.214.171.124.) and I will run it. Meanwhile -- here is an addendum to my original post:
I have run Sophos Virus Removal, AVG 2015, Malware Anti-Malware and Emisisoft Emergency Kit. NONE of these have reported the Backdoor.Hupigon/Variant. My computer is not running slower and I have not had any noticible problems of any kind -- except for Super AntiSpyware finding and reporting Backdoor.Hupigon/Variant each time I run it. :-0
RKill Ver. 2.7.0 found no problems. Kaspersky tdsskiller.exe 126.96.36.199 - no threats found
So . . . I deleted Super AntiSpyware, restarted the computer, and it found new hardware - unknown, could not install [No big deal - everything appears to be working okay.] Next I downloaded and installed Super AntiSpyware 6.0.1168 Free Edition (again), ran a complete scan, and it did not find anything this time. I can only conclude it was an anomaly? However, I did notice other folks have had this same issue with Super AntiSpyware [when I searched in my search engine].
The deal with Rkill.com is most bizarre! It was not on my desktop before, and when I did download it and run it (January 24th), it was put in a totally different location than the screen capture showed. Very strange indeed.
I ran a complete scan again today using SuperAntispyware and again it showed my computer being clean.
You are so right about Windows XP. I have been holding out for Windows 10, as I am not a fan of Windows 8 or 8.1 at all. Thank you again for your help!