Crashes like that can be extremely frustrating, especially if it does not say what is causing it.
Does your computer find the solution?
This thread may help you out:
http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=45737.0You should take a look at 'Section 3' about a clean re-installation.
If you are lucky, this should solve your problem.
If not, then I guess you should take a look at Section 1! The problem may be duplicated particles,
exports, presets, media files or CGF files. But, considering you redownloaded the game,
none of these may be the issue.