Ok, so I'm gonna show you how to get Windows 7. (Don't worry, it's not a virus and it is able to upgrade, so you don't have to reboot all your files.)
First you are going to have to download a torrent downloader. I recommend you get uTorrent. You can check it up on google or go to uTorrent.com
For those who aren't sure, or just don't trust it, uTorrent is used to download torrents and torrents a user created downloads.(Some do have viruses, but you can usually tell on the amount of leechers+seeders).
Well, once you have uTorrent downloaded, download the Windows 7 torrent from the link belowmininova.org 3067717
Click run or save (Your decision, it doesn't matter, just make sure you run it afterwards)
So it should take a couple of hours to download. And after that you should have all the Windows 7 files in a folder. That you can find by right clicking on your torrent on uTorrent(You'll know what I mean when you run it) and press "Open containing folder". You should have a .zip or .iso file.
Download PowerIso from the link belowhttp://www.poweriso.com/
Once you have that downloaded (Used to open up the .iso file and burn it onto a DVD) put the DVD(-R or +R, it doesn't matter) in your drive/CD Compartment. Open up the file with PowerIso and on the bottom there should be a button saying "Burn" or on the top.
When you FINALLY have Windows 7 onto your CD, reboot your computer if you want to do a clean reformat (Erase EVERYTHING) or just load the CD when your on your desktop for a upgrade (Just upgrades to Windows 7, keeps all files, all background, hard drive, everything, etc.)
The installation is very thurough, not hard to install (A chimp could install it
Congratulations! You now officially own Windows 7 Ultimate, Pre-Activated for FREE!
PS: If you do a clean reboot, Windows 7 comes with basic Ethernet, Sata, IDE and Processor drivers so don't worry you wont be able to get the drivers. PM me for help, I'm almost available at any moment of the day. Also, ask me if you'd like the links for some of the drivers.