.htpasswd

At a guess, the pw is wrongly encoded:
http://www.clockwatchers.com/htaccess_tool.html

That’s an IIS problem, and way beyond what I know…

Its always going to be hard to support folk that insist on running EasyPhp and other unusual configurations – when you take them on you have to accept that sometimes its not always going to go your way 😀

I’d bite the bullet and download Apache and PHP and get standard – you’ll learn a thing or two and wind up enjoying the experience a whole lot more. Yeah EasyPHP has these components, but they are not the recommended means for installing the software and its just going to make your life difficult.

True, but it’s really an easyPHP/Apache question vs WordPress. Obviously we’ll help if we can but you’ll have a better chance finding an answer with an Apache forum.

Have you tried putting your username in quotes?
AuthName "Motdepasse"