I am trying to export a file from CS6 to a PDF interactive file. Every time I try CS6 crashes and I can't figure out why considering the pre-flight check says everything is ok. I am running Windows 7
It's most likely a problem with an image, but the only way to find out in Windows is "divide and conquer."
Try exporting the front half, then the back half. If both halves export successfully, it's a system resources issue and there's nothing really to do but combine the two halves in Acrobat.
If either half fails, divide it again and repeat. Continue to divide any part that fails until you isolate a page, then remove half the content from the page to do a similar analysis. You may want to do all this on a copy.