A few of us at work just worked out how to install Catia V5 R15 on a Vista machine. It seems to run fairly well to. What we did, was installed Catia in safe mode. That will allow you to actually install it on the machine. To get it to run properly, you will have to ensure that your graphics card supports open GL. Despite what most people believe, Vista, fully supports Open GL, you do have to check to make sure that your graphics card driver supports open GL with Vista. You may have to go into your graphics card application and change the 3D settings to open GL. The install process would probally still be valid for R17 as well, but we have not tried it.