Since I hadn't gotten a reply, I tried to dig deeper into this issue.
I found that, my compatability doesn't match.
Therefore the program won't install.
Since I had windows 7 before and now have windows 8, I guess this should have been simply enough from the beginning to answer.
I guess, now I have to hope that Paint.NET 4 comes out, soon.
REALLY SOON!!!
& then hope the best from there.
I really hate to have to move to a new program, paint.net is like the best, and I just really wanted it on my new computer, I guess I can't.
:-(