As earlier posts on this forum say, I think no one has been able to install the Compaq Fortran on 64-bit Windows. I doubt the older Digital Fortran would do any better. If that doesn't defeat your idea of normal operation, you could simply copy the .exe and .dll's into a folder. In principle, then, it could run.
You could copy the directory structure of a DVF installation over into the Program Files (x86) directory, and set the PATH analogous to what it is on a 32-bit Windows installation.
Remember that 64-bit Windows doesn't put 32-bit .dll's in SYSTEM32; instead it puts them in SYSWOW64, so you may be better off keeping any .dll's from your application or from DVF in their own directories. So, you can see, you may have to adjust your definition of normality for this to have any chance.
It is possible to make a shortcut which runs a 32-bit .exe explicitly under syswow64, in case it doesn't happen automatically. wow64 apparently stands for something like windows (32) on windows-64.
Any computer capable of running 64-bit Windows should benefit from re-compiling an application with ifort.
