Couple of things with Rendering. First check where your "Preview" scratch disk location is set. This is the folder Premiere writes to. If it is in a directory that doesn't have sufficient privileges, Premiere will not be able to render. If the directory is ok, I would suggest throwing out the project folder of renders inside the Previews folder and letting it start over. Many times Premiere Jams up while trying to render due to old or existing render files.