It's best to export with the version that created the project. What version was that?
That said, in the export configuration box there are options for many formats. Click the RESOLUTION box and test some of the choices.
Share your project and someone will check it out. Here's how: http://nch.invisionzone.com/topic/23659-tips-for-getting-help-on-this-forum/
Be sure to FILE|SAVE PORTABLE PROJECT AS, not simply as Save Project. If content is sensitive, link it to me in a personal message via the envelope at the top of this forum.