MotiveSB.exe was the culprit. Once I killed the process ImgBurn started up in seconds and runs infinitely faster. FYI, Motive Smart Bridge is software used by many of the broadband internet providers like AT&T, Verizon, etc. It is part of the AT&T Self Support Tool on my PC. It's not necessary for everyday use so disabling it should be a good solution.
I also ran the 2 tools you suggested and they seem to work well.
Thanks.