The reason this is happening is because in Snow Leopard all the plug-ins that work with Safari are now independent processes. So that makes Safari more stable than it was in Leopard. So if you think it is taking more CPU its coz its a seperate process.
Ideally you have nothing to worry about but if you would still like to remove it and reinstall then you can remove it from:
Mac HD/Library/Internet Plug-ins/FlashPlayer.plugin
Mac HD/Library/Internet Plug-ins/FlashPlayer.xpt
It can be downloaded from
http://www.apple.com/downloads/macosx/internet_utilities/adobeflashplayer.html
Restart the Mac after you finish installing the player and make sure to have Quit Safari and other browsers before the installation.
Hope this helps dude..!! 🙂