More details !
Do U get an error about it?
Do U want to download/update it? http://get.adobe.com/flashplayer/ (for ie, choose another if U have a different browser)
Do U have problems with your videos? (see hardware acc. settings)
this is just a guess--- if you beleive that you allready have the flash player installed, then go to the control paney/add and remove programs and uninstall abobe flash player, then go adobe website and download a new flash player, just watch for the information bar at the top of the page, right click it and allow.