The "ifort.exe" executable is the name of the Intel Fortran compiler. If I remember right, the Compaq fortran compiler is called "df.exe". It is quite possible that your Fortran compiler is simply too old
You might be able to solve the problem by modifying your abaqus_v6.env file. Specifically, change the "ifort" strings to "df". I am not sure if that will work or not, but it might be worth a try if you do not want to purchase the Intel compilers.
Jorgen Bergstrom, Ph.D.