Dragonsaver, are you using Windows to do basic computing? By this I mean surf the internet, create and edit documents, store photos, play music, that kind of thing? If so,
Linux Ubuntu has several advantages over Windows. It's free, so you don't need to choose between paying and running a dodgy pirate version. It's very stable, and doesn't gradually make your computer slow down (unlike Windows). It's based on the same under-the-bonnet nuts and bolts as the Apple Mac operating system, has a vaguely Maccy feel, and tends to be a fair bit faster than Windows.
There's lots of free software that duplicates commercial software and which you can download from the control panel with one click, in particular
LibreOffice - fully compatible with Microsoft office - and
Gimp - which comes damn close to doing everything that Photoshop does. (Those both work with with Windows too, by the way.) The only disadvantages I can see are that it's not exactly the same as Windows, so it take little while to get used to it, and although there is a program called WINE which will let you run Windows-only software, it's a bit hit-and-miss, so you're probably better off using free alternatives such as the ones mentioned above. Support for printers, scanners etc is fairly good, but there can also be the occasional headache there. I have two computers - a desktop running Windows and a laptop running Linux Ubuntu, which does everything I need on a day-to-day basis.
As said above, if you're not dependent on using Windows-only programs, and can spare the time to figure it out, I'd recommend Ubuntu as a life-long switch. I only persist with Windows on my desktop because I use work-related quiz-creator and graphic design software which is isn't compatible with Linux. Here's the link:
http://www.ubuntu.com/