Well you may or may not have heard of it, but it is the new windows. I don’t have, but i have watched some reviews for it on YouTube. i have also used Tim's. you can download it for free from the Microsoft website. I’m not going to download it, even though i really want to. The reason for this is because if i download/install a new operating system (OS) it will ruin my insurance on my new laptop.
The biggest change in windows 7 is the taskbar. it has icons that you can pin to it like in vista, but there bigger, and round. they glow if you have it opened, and if you have something minimized it will minimize in to the icon. then you can run your mouse over it, and a little preview will open, if you run your mouse on that preview it will show a full screen preview. But nothing will open unless clicked.
Another big change is in paint. it has all the old items, and some new ones like different styles of brushes, which can make some cool designs. once you draw something it will smooth the edges, so the painting looks better and more professional.
Windows 7 has some other small things like that, but it also runs better and faster. I don’t know all that much about Windows 7, there are defiantly a lot of other thing that have been improved, but there still might be some bugs.
The reason you can download it for free is because it’s not complete yet, and want to get reviews from people so they know what to fix/improve/remove/add. I wouldn’t worry about there being any viruses though because Microsoft knows what there doing, and there good at it.