Windows XP SP3 includes vulnerable Flash Player
Important info for admins deploying XP SP3:
More info here
Microsoft Corp.'s Windows XP Service Pack 3 (SP3) ships with an out-of-date version of Adobe's Flash Player that's vulnerable to recently-spotted attacks, according to Microsoft's support documentation. Windows XP SP3 includes Flash Player 184.108.40.206, a version released by Adobe Systems Inc. in December 2007. That version of Flash Player, however, was superseded by version 220.127.116.11 on April 8, nearly two weeks before Microsoft decided SP3 was done by giving it a Release To Manufacturing (RTM) label and sending it out for distribution.
Check what version you're running here You should be running 18.104.22.168 to be safe :)
If you're looking to install/deploy Flash 22.214.171.124 you can read an article I've created here