FlashBack is a free PowerPoint add-in from Shyam Pillai, a Microsoft PowerPoint MVP that rewinds a Flash movie so that it plays from the starting frame when shown again in the same presentation. You can learn more about why rewinding is required here…
FlashBack automates a lengthy process that requires some coding in a VBA environment. You can download a free copy of FlashBack from Shyam’s site…
Remember though that FlashBack is machine specific, not presentation specific. If you need to add the rewinding code to a presentation that will be distributed, you should use the VBA route…
Learn how to install and disable FlashBack…
And here’s information on how you can use FlashBack…