It is causing a problem because I can't install a new version of it without removing the old version. I need the new version for applications, but when I'm installing the application, it says it cannot find this file and it recommends me to install it. When I try to install the latest version off of the Microsoft website, it tells me that an existing one already exists, but it actually doesn't exist. I've been trying to troubleshoot it, but with no luck, I still can't uninstall it. By clean machine OS installation, do you mean a factory reset? Thanks for your time.