Quote: "is there a version of mac's OS that works on PC?"
I imagine they have just installed an off the shelf version of Leopard, the latest Apple OS, maybe with a bit of jiggery pokery to get it working. However in the EULA for Leopard it says something about not installing it on any Non-Apple hardware and if you attempted to update the operating system it would probably end up borked. Best get used to clicking that cancel button.
It is much easier to get a decent, working version of Windows on a Mac than it is to get OS X on a Windows Machine.
Quote: "i never liked the one button mouse that macs have."
Mac laptops come with just the one mouse button, right-click is referred to as control-click because holding down the ctrl button when clicking has the same effect as a right click. I believe there is a similar way of doing it just using the touch pad with the newer models but I'm not sure.
The mouse that comes with desktop machines is the same mouse that empty linked to. It has both left and right click ability. I'm not sure if it's touch sensitive or just very, very sensitive. Mine seems to click with the lightest of touches. I've seen a few mac journalists say it's not really all that good, I've got one myself and I'm not a big fan either, perhaps if I got used to it but I manage fine with a bog standard cheapo buttoned mouse.