I have been playing with my brand new MBP since last christmas. I have installed a bunch of applications (most of them demos) But I have deleted all the ones that I did not like or did not find useful. However everyday I find remains (as in files and folders) of these deleted apps. I am not sure if in time they hill hinder the performance of my mac or how much of my valuable space they are using. I would also like to get rid of some bundle software like office 30 day trial and drivers or language options that I dont need (I just need english and spanish) My questions are: 1) Will I gain anything from reinstalling the OS and getting rid of these trash files. (my MBP is running as fast as it always has but after I installed pocket mac it struggled a bit for a while) 2) Will I be able to select from the bundled software what gets installed and what not? (same applies for drivers and language support) This will be the first time reinstaling the MacOS, although as every windows owner I have had to reinstalled windows like billions of times. How long will it take? As I said before, There is nothing wrong with the current instal, just a mess of left over files. Now that I have tried a few programs I want to start clean and install only the ones that I want and keep my mac as lean as posible. thanks for your helpful replies.