Installation of OS into virtual box, final step (what's wrong?)

I had everything created (iso and bootable flashdrive with OS plugged in). Then I went to have the program controller be the iso i created for windows as seen here


but the program doesnt recognize the iso (Ive shown the folder that requires you to open which ISO u want, but it doesnt see the one i created as a valid possibility)
I tried doing something else in my next screen shot

It's not really clear what you are trying to do. You assign the ISO to an optical drive. From your screenshot you are trying to assign it to a hard drive.

oh, i thought that optical drives were physical

okay success. although I did get to a screen where not sure what to do with the operating system

this is what I get when I try to do the traditional way for installing Windows

this is what I get when I do the custom choice