i know this may be a newbie question, but upon installing certain programs such as kazaa or even yahoo msnger after trying to open them an icon pops up and bounces a few times in the task bar then disappears. nothing starts up.what does this mean i follow the installation procedures to the tee. i have all the update on Mac OS X not to mention all applicable hardware. what am i doing wrong. im used to windows is there a missing step. I've searched most forum sights and no one seems to have answers.