In the latest Mozilla Firefox Newsletter, it was noted that in preparation for the Firefox 4.0 release that we should upgrade our graphic card with NVIDIA, however, when I go to the NVIDIA website and go through the download to upgrade, I get a message saying that it can't find a previous version to upgrade from, but in my files, the version of the 500 series is there. Should I uninstall that older version and do a clean install of a newer version?