Right, everyone I know thinks I'm a fanboy and should be shot because of my rather strong opinions in the OS world. But, my reasons are, as far as I can see, justified.
I've been a Windows user since I was 6. That's 8 years, by the way. My grandad built me a basic, but powerful enough PC back in 1999 - 2000 sort of time, with 32MB RAM, and it was running Windows 98, with a not-to-bad Pentium III, I think...bit of a long time ago.
Anyways that was the first computer I ever used. I was mesmorised by it, intrigued. It was pretty simple to pick up and I was using office applications and everything with pretty good knowledge of them in no time at all.
Then I learned about the Internet, from an AOL (yuck!) advert. I nagged my mum loads and eventually I got AOL dialup. Painfully slow, but it was enough, then. I wasn't using Azureus and DownThemAll back then.
One day when I came to use the computer to surf a bit, it was really slow, much more so than usual. I noticed weird things happen, popups would appear, which I now know to be adware. I got frustrated, but I formatted the PC under my grandad's supervision, and got it set up and running again in no time.
Then I upgraded.......no.......downgraded
to Windows ME. At first, nothing was wrong and all went really well. But then I tried to install some new RAM, and got blue screens of death over and over. I tried to recover the system, and failed.
Recently (last couple of years), I've been looking into the power of the Linux desktop. I've used Ubuntu, Mandriva, Vector, and openSUSE, and I like them all. I do still use Vista and XP, but the eye candy in Vista sucks compared to that of compiz fusion in openSUSE. The system gets no malware, partly because not many use it (relativiely, that is) and it may have something to do with the secure shell everything runs in, I'm not a programmer so I couldn't tell you.
But to cut a long story short, Linux is customisable, pretty, and powerful, not to mention secure. Sure it can be a pain in the backside sometimes, but so can Windows and OS X.