I am about to purchase my first laptop, a Gateway NV5214u. Its my first PC aside from an old, almost unusable desktop. Ive grown up a Mac user and I am going into my sophomore year of high school. I really dont know much about these operating systems. I get a free upgrade to Windows 7 but to me (someone who is not too PC savvy) what are the major and/or noticeable differences between Windows Vista and Windows 7?