I wish there were more people like you asking themselves the same question...
Because the greedy stock holders at Microsoft have conned both the consumer (you) into buying their crap and the manufacturers into putting their crap on every machine they built, being afraid it won't sell otherwise.
I have Linux Mint, Ubuntu and Mac OS X Snow leopard on all my computers. I quit using Windows 2 years ago and never even looked back.
Microsoft Windows and Mac OS X cost money, they made and maintained by huge corporations.
All Linux operating systems are 100% free, made by the people, for the people.
Just choose one, download and install. And by the way all Linux apps (programs) are free also. Also Linux cannot be infected or corrupted by any virus, so you will never need antivirus, anti malware or anti anything programs.
I recommend Linux Mint 11 Katya, as it is more user friendly and has an interface somewhat similar to Windows, thus making the transition smoother.
Download Linux Mint here:
http://www.linuxmint.com/edition.php?id=81
The 32bit version of Linux is not handicapped like Windows, it will recognize, read and use up to 64GB of RAM, no need for a 64bit version.
Here is another useful link, Distro Watch (a version or release of Linux is called a Distro, from distribution, I guess)
http://distrowatch.com/
Good luck and welcome to the wonderful world of Linux.
Since you were saying how cool your friends desktop looks, take a look at mine:
http://i280.photobucket.com/albums/kk177/Doruletzul/LinuxSystemMonitor.png