I think I might reinstall, but I would download the ISO file again, check the
Sha 1 Hash to ensure a good download (Hash Tab works by installing, then check file properties, you will now see a tab for Sha 1 Hash), burn to DVD with a maximum 4X burn (the native Win 7 and Win 8 OS burner does a great job of this), reboot to the DVD and Clean Install for the best installation.