Right now i have Solidworks 2015 and 2016 on my computer. I thought i got rid of 2015 but when i go to uninstall it, it says Solidworks 2015 Plastics is still installed. I proceed to uninstall and about 3/4 of the way through, it fails. I also tried repairing and updating, each time failing. I looked for any solidworks files on my computer but found nothing. All that remains is the Program that is displayed in Control panel under programs. I saw previous posts that linked this ( Download Windows Installer CleanUp Utility - MajorGeeks ). I didn't try this because it wasn't from Microsoft's website, and it was a very old post.