Okay, I have to stop you right there, because the ignorance of this statement is staggering.
The term PC - personal computer refers to the new line of computer sold in the late 70s. They were called personal, because up to that point every computer was multi user, because computers cost way too much for one person to pay. As such, "PC" is a completely non descriptive term in personal computers. When Microsoft came along in the 80s with DOS "PC" was sort of hijacked to mean the Intel x86 platform. Any processor that was compatible with that was a PC, and could run DOS and later Windows. The term PC-compatible came up. Around the same time Apple came out with the Mac. It was not Intel based and not "PC-compatible", their chips were made by Motorola, later they switched to the IBM Power PC cpu architecture.
Thus far, the distinction "PC or Mac" makes a certain amount of practical sense. All through this, Apple has always claimed their hardware superior to the lowly PC. Then came the ironic twist. IBM decided they could not keep up with Intel and AMD and that their line of cpus, the powerpc, didn't have much of a future. Apple switched their whole line to the Intel x86. The Mac became a PC. Today there is no difference whatsoever between "a Mac" and "a PC", beyond the color of the plastic and the particular hardware peripherals like network adapter etc.
In fact, Apple is now advertising the fact you can run Windows, yes Windows, on "a Mac". That's because the Mac is actually just a regular PC, there's no magic here. It is entirely possible to run both Windows and Mac OS X (and Linux) on the same PC, whether there's a silly apple on the plastic or not. I've done it myself.
So when you said "Windows-based PC's" as opposed to Macs, it was very misinformed in its formulation. PCs are not "Windows based", there is an illusion that they are because Microsoft is using their near-monopoly to reinforce their near-monopoly by making PC makers bundle Windows with machines, strangling competition. This in the so called "free market".
Linux, in turn, is not tied to the Intel x86 platform and runs on just about every single piece of hardware. You can get Ubuntu for both the powerpc (the old Mac) and Intel x86.
I don't mean to patronize you, but from what you said it's hard to tell what you know and what you don't.
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