Your two basic choices are Adobe Dreamweaver and Microsoft Expression. (There's also KompoZer for Linux - which really needs to be considered a late beta product.)
FWIW both MS Expression and Dreamweaver have fairly steep learning curves before you can use them effectively
. So they're not exactly something that you can just sit down with and bang out webpages. Well...you can...but you'll soon regret it if you don't understand how those products work - and don't see things the way they do.
My feeling is you'd be far better off immersing yourself in HTML and CSS until you understand how they actually work (on a code level) before you try out anything that automates the process for you. Neither is difficult to understand or hard to learn.
WYSIWYG web tools may be fine for a professional developer. But for a beginner or novice they'll probably be more confusing than helpful.
So my advice is forget WYSIWYG and get yourself a good book or two, plus a text editor you can work with, and have at it.
WYSIWYG is intrinsically limited by what the creators of the app thought somebody might want to do with it. Writing the code yourself (or copying/modifying/pasting somebody else's code) takes you beyond what a code generator (which is what WYSIWYG actually is) is capable of - no matter how powerful it may be. Writing HTML/CSS code is more WYGIWYI (What You Get is What You Imagine).
So what 's the best WYSIWYG HTML editor?
My answer: The best is a person
who understands HTML and CSS code.
Because at the end of the day, that person always has their webpages come out exactly the way they want them to.