Look at your contract. See what it states for the make / model / type of window. They are legally responsible to give you what the contract states.

So the paper work you signed says it's an all wood window? If so it's not the end of the world, keep them painted every few years and you'll be okay. If that't not what is on the contract they should certainly correct their mistake. Either way the company should have been more clear on what they were ordering to you, but in the end you have to read quotes and contracts.

As stated above, you are entitled to whatever is specified on your contract. If they installed something else, that is on them, not you, and up to you whether or not you are willing to accept it.
If it was a communication error and you THOUGHT you were getting aluminum clad but did not and they installed what was specified, unfortunately you would not have any recourse. That said, just keep up the paint as FenTaylor said and you'll be fine.

No, I am clearly in the right and they are clearly in the wrong... in writing. The only paperwork I signed has a clear X in the box indicating alum. cladding and specifies the color as white. What they installed was the same wood windows minus the cladding.

I just didn't know if I was being unreasonable to insist on what I ordered. (seems self-evident when I write it out, I guess).

Usually an all wood window is less than an aluminum clad window depending on some of the options. Not many brands do a prefinish paint exterior wood window. What is the brand of window, you don't need to say who you bought them from.

If in the quote and contract you signed it says aluminum clad windows and you received a different product (wood), then the issue clearly needs to be addressed by the company you bought them from. If worse comes to worse either contact the manufacturer direct to put pressure on their dealer or some sort of legal action (although a last resort, no one likes that mess).

What is the manufacturer and model of product? That will often determine whether or not it should be clad. The checked box could be regarding cladding the trim around the window with aluminum as opposed to the product itself being clad.... Hopefully that is not the case however, and you are indeed in the right. If so, it is up to you if you want to demand the correct product, or accept what they installed... perhaps at a discounted rate?

Great point HomeSealed..the checked box could of very well meant capping/ cladding the exterior trim and not the actual window.

I agree. Most lines are not sold with an option for cladding. They either come clad, or not. Hope for the best though.

Agreed as Karate states cladding is not an option it is generally a different window line or series. Maybe post a copy of what the order form shows?

Hmmm... the box could relate to exterior trim. It says "Custom Wrap Windows with PVC Coated Aluminum"

It looks like the sales person only listed manufacturer, Trimline. Not an actual model.

However, looking at it again, while the above section may be relative to trim, a few sections down, there are four colors listed, and white is circled. Looking back at the manufacturer's website, the only option that has four color options is cladding color - white, almond, cocoa, and bronze.

Additionally, it also says (on manufacturer website) that custom colors available... and on the order sheet, it says "Other__________"

Impossible for us to tell from here without seeing the paperwork. It sounds like you have a clad order form again without seeing it........... However says the Legend Series is Clad and the Liberty is All wood but that is on the Trimline order-form.