Microsoft is introducing new Service Pack 2 for Windows XP users. ( more info at microsoft page )
This update should increase Internet Explorer’s security features. Also Macromedia seems have worked to support changes will arrive with this new service pack and provide a page with some FAQ about issue could happens after SP2 has been installed.
– Flash Player content does not appear after a Windows Update
– SWF files prompt a message when played back locally
read all the informations at http://www.macromedia.com/support/service/servicepack2.html