I have just received this package in the mail of install discs I bought from amazon for my macbook pro, & I have sent off to Adobe for the serial number; I bought the student version. There are 3 discs, & Googled installation & read some bad things, now I am nervous. also, I have downloaded & installed the trial versions of CS5 photoshop & illustrator on my mac now. should I uninstall the downloads & start fresh with my discs? how do I go about this? I am on a macbook pro 2010 i7 with snowleopard.