Hi,
I had same problems with abaqus 6.7-1 but I finally managed to get it working.
I advise you to check the requirments for abaqus 6.6, you have to type in the abaqus command window: abaqus info=system
you note eveything what is needed for your installation (example for abaqus 6.7-1, Microsoft Visual c++ 7 and Intel Visual Fortran 8.1 or 9.1 are required).
here:
First of all, remove all previous installations of abaqus, fortran and visual c++.
You start by installing Microsoft Visual C++, when you are prompted to update environnment variables, you choose yes.
At the end of the installation, you try to locate vcvars32.bat and you run it (this will ensure that environnement variables are updated).
Second step, you have to install the visual fortran, I believe from the link above that is Intel visual fortran 8.
when the installation is finished, you try to locate the file : ifortvars32.bat and you run it.
You install abaqus documentation, licensing utilities, startd the server, install abaqus products.
When all is done, check again with the command : abaqus info=system.
You may have to update some variables manualy. I'll try to guide you throw that process after...step by step
Sorry for my english