If you still think that operating systems are tied to hardware, you need to update your thinking; nowadays there are lots of options that let you run one operating system within another or in parallel ...

You would need to purchase a Windows license from TrollTech because the Qt/Windows Free Edition only supports MSVC++. The KDE on Cygwin project has gotten Qt/X11 Free Edition to build in Windows usign ...

If speed isn't an issue you could try Cygwin which comes with gcc which includes a fortran compiler. I mention speed because IMO apps running under cygwin are noticably slower than 'native' ones. And ...