Im giving you nothing ...
... because I havent watched it yet, but to be able to reinstall it go in your registry in - C:\Windows\regedit.exe - Go in to the main program directory and delete all rgistry of Flash 5 or macromedia if you have nothing else made by them on your system. This should let you reinstall it and then goto a good cracking site and try to find a crack for it, http://www.cracks.am is a very good one