There are 2 type of inquiries you can do... one targeted to the size of property you need 2/3/4/5 bedrooms...and a general inquiry.
You did a general inquiry (I received / saw it). So...it went out to everyone in Windsor Hills. This means you will be getting TONS of responses (I usually don't suggest people do this, but hey, too late now! hehe)
It's actually probably ok that you did though, as there are not very many 4 bedroom homes in the resort, and you can probably find a 5 bedroom pool home for basically the same price. It's good to have the quotes for comparison.
You're getting rejected emails because some owners have bad email addresses linked to their WHR ad site, sorry, I've asked the site admin about this before but it happens, it's not your email that's the issue, some people have bad or old email addresses linked to the site.
To find properties, you just click on their ad, their calendar (check for availability / etc), or when an owner sends you a quote, you should hopefully have a link to their website so you can check it out further. It's a bit of work to look through the various properties, and the quality of the furnishings and the amenities offered does vary from home-home, this is the time consuming part of the process, and I don't know of an easy way to simplify it for you unfortunately, you just have to "Shop" around on the web and take a look at the various properties and find one you like, has availability, etc for what you're looking for!
Some people have requirements like internet, themed rooms, etc, if this was important to you I would have suggested you put it in the notes field when you make the inquiry.
Best of luck! Do come back and ask for advice / help here, we're glad to help! I'm an owner in Windsor Hills myself (townhomes though), and there are lots of other DIS board members who have stayed in various resort homes at Windsor Hills as well who I'm sure would be happy to help you or make recommendations based on homes they have stayed in themselves!