Trying to run a job w/ a subroutine and getting error "Unsupported 16-bit Application"

[OverWorked453]

I am trying to run a subroutine with ABAQUS for the first time. In the command window, I type:

Job=(name) user=(name)

Then an error box pops up titled "Unsupported 16-bit Application" and says the following:

"The program or feature "\??\C:\SIMULIA\temp\job.com cannot start or run due to incompatibility with 64-bit versions of Windows."

I am using Windows Vista and a 64-bit operating system. Any ideas on how to fix this problem? All I want to do is run my job with my subroutine that I wrote in FORTRAN.

Thanks!