I just got a brand new computer for my work. It is a Dell Precision T1600 workstation. Windows 7, nvida graphics card, the works. But my autocad mechanical works perfect, and as im sure you know they both downloaded and installed at the same time on the inventor 2010 DVDs. I have run tests and made sure i didnt have a virus or anything on my computer and everything checked out fine. Its just Inventor. It was working yesterday perfectly.