I am running MS Windows XP Professional X64 (Server2003) SP 2 Build 3790 / 5.2.3790 and internet explorer seven 7.05730.13 and have installed flash player 11.6.602.180
The above OS runs WOW Windows on windows as a standard feature and is capable running (and does run) both 32 bit and 64 bit programes
Flash is not recognised by the Flash player in 3 steps screen and when attempting to play videos on YouTube I get a dialouge which reads: "You need Adobe Flash player to watch this video Download it from Adobe"
"And You are using an outdated browser which youtube no longer supports "
Which is odd because I got the same result with IE 8 and an adjacent machine running IE8 and XP 32 bit works perfectly