Thank you, Nhasian.
I did try that and many other workarounds but I always get a pop-up message saying something similar to "Program cannot continue because the program is closing.
I manuallly deleted HP file in both Program Files and Progra, Files (x86), but cannot file the register entries to finish the job. I also am worried not damage the OS installation so that;s probably it.
Anyway, thank you for your help.