Is GFortran supposed to work on Windows2000? If so, could you help me troubleshoot? If not, could you please confirm that this is the case? I installed the GFortran mingw build / "native Windows": installer (2006-01-20) on a Windows2000 pc. I used all default settings when running the installer. The default installation directory is C:\Program Files\gfortran, which has bin, include, lib, and libexec directories that are each populated with numerous files and subdirectories. My path variable is set to C:\Program Files\gfortran\bin. I get the error message below when I try to compile a simple file as follows: C:\computing\che536>gfortran hello.f95 -o hello.exe <built-in>:0: internal compiler error: Illegal instructio Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://gcc.gnu.org/bugs.html> for instructions. I get the same error message after the following command: C:\computing\che536>gfortran -c hello.f95 The file C:\computing\che536\hello.f95 conists of the following: program hello implicit none write(*,*)'Hello World!' stop end program hello Can you help me diagnose the problem? Is there any other info you need from me? You assistance would be greatly appreciated. Thank you, Kurt Cenek phone: 847-391-2183 fax: 847-391-2253 kjcenek@xxxxxxxxxxx