I have been using Windows 7 Professional ever since it first came out. Now I have this notice that I can receive a free Windows 10 Upgrade for the first year. Do you know if I can run this upgrade without having to reinstall the entire system? I have almost 1 TB of data and programs, and do not have a convenient way of backup everything up first. I'm currently running wireless, and at the speeds I have to the router, it will literally take about 2 or 3 weeks to copy everything over to the NAS.