Need help opening .prt files in Inventor 2011

We keep getting an error when opening the drawings from this website:

I have used NX, SolidWorks, and Pro/Engineer translators. Is there any way I can import these? I don’t have administrator access to the computer.

Autodesk Inventor 2011 doesn’t support reading SolidWorks 2011 files, so please try to save IGES/STEP/Parasolid files from SolidWorks and then open them in Inventor