how to insert a flash (.exe) in a power point presentation ?

Answer 1

You have to change the flash.exe to an swf file. Here is how you get the information to do that http://dholzemer.wordpress.com/2005/03/29/ps-using-swf-in-powerpoint/

Answer 2

Extract the swf from exe using this:
http://www.swftools.com/tools-details.php?tool=6341163190
and after this you can use this free plugin for doing this (if you have an Power point older than 2003)
http://www.globfx.com/products/
Swiff powerpoint for powerpoint