I am brand new to Macs- just got a Macbbok Pro. When I first got the machine Flash player was working fine and then suddenly it disappeared. I re-installed from Adobe (10) and it was working fine again. Went to youtube/Live Leak and again I can't play video.?! I reinstall again and it is working again. My guess is that I am deleting the player myself. My understanding is that once an app is installed to the hard drive I can delete the .dmg from the applications folder. Also on the desktop is a drive icon "Install Flash Player 10 UB". I also assumed that I could delete this too. Am I wrong? Must one of these items remain? Any replys appreciated. I already read the "Installing Applications" guide here but is doesn't address this problem. Thanks to all!