Hi Lance,
I am not in this technical depth of iDempiere, but I wonder which install routine (old installer 2.0) or which part of the stepwise normal install routines (in which version) you refer to. And what is the exact message your iDempiere installer gives you?
These information would help to locate your problem.
As you can see by the installation descriptions e.g. below in Windows a lot is controlled by the (system) variables of windows. You say you took all out, and I hope you did the necessary restart after changing the system variables.
If you look for manual installation steps most instructive for me were the following description:
http://codingtrabla.blogspot.de/2016/08/install-idempiere-erp-on-windows-7-x64.html <
http://codingtrabla.blogspot.de/2016/08/install-idempiere-erp-on-windows-7-x64.html>
It says win 7 but that is very similar to Win 10. There are many pictures, some advertisement and also a helpful video. ;-)
Best regards and hope you find a solution,
Frank