I can't imagine the way amazon tells to do it on https://www.amazon.com/gp/ubp/misc/uninstall/instructions.html isn't free. Did you try it?
I seem to have an Amazon Assistant aa.hta "virus" or malware or something on my laptop. I can't remove the program as the uninstall button is greyed out. Everything I see sends you to buy a program to remove. I'm not tech saavy so I'm not sure how much I could do if it's too involved. Help!