You know, I hate this rant. Look, you bought a computer, and windows was what you bought with it. If I buy a computer from Dell, I can't buy it with no RAM (at least not for most of their consumer products), or return the RAM saying I want a refund. I bought a computer system. Same as I can't buy a Nokia phone without the software that comes with it.
The problem is not with the return policy on windows, nor the "bundling" as you call it. The only way that this is a problem is if Microsoft is coercing the manufacturer's into using only Windows. Consider Microsoft an outsourced manufacturer of a part for the PC, like RAM or a HD. It's really not their problem if Dell or HP or whomever uses them as the single source vendor for that particular part.