If I'm following you , you clicked on the win2kpro_makebt32 from within the 7zip program?
If that's correct you missed a step.
Quote:
choose to extract files and in the window browse to the desktop folder 2000 boot disk |
You need to choose extract files. Then run it from the new folder it creates.
Also in windows explorer (my computer) make sure it is seeing the floppy drive as A:\