Hey Everyone, So this is my concern. I currently have a macbook that has been upgraded to every OS from Leopard. It is PAINFULLY slow. My macbook only has 2 gb of ram, but I read that doing a fresh install of OS X yosemite will greatly help the performance. I do not need any of my files on my macbook, as I have an iMac (late 2012) that I bought in September of 2013 and use on OS X Yosemite as well. All my files are saved on there. Here is my question? How do I do a fresh install of OS X? and will I need to reinstall certain programs? Sibelius, photoshop etc?