Hi,
I visited so many forums for converting ppt files to flash. Ultimately found the solution here.
www.ppt2flashsdk.com
Hope it will help you.
Me to found a lot help from www.ppt2flashsdk.com site.
I'd recommend iSpring Free http://www.ispringfree.com, accurate and easy tool for creating Flash from PowerPoint. It's absolutely free for educational use.
There is also a paid version, iSpring Presenter that allows to create SCORM complain Flash courses that can be uploaded and integrated with Moodle.