If you are using WordPress and Windows Live Writer together and you are having problems, maybe these solutions from WordPress.org can help you.

• Image uploading fails
• Posting fails for some blogs that don’t use UTF-8, ISO-8859-1, or US-ASCII encodings
• Bad Behavior plugin doesn’t like Windows Live Writer
• Invalid response from blogger.getUsersBlog
• Non-ASCII characters render incorrectly on UTF-8 encoded blogs
• ArgumentOutOfRangeException while attempting to open posts from WordPress blogs

• Windows Live Writer WordPress and the XMLRPC Issue
  Sometimes when you try to set up a new blog account with the Windows Live Writer the installation process might be interrupted by an error message: Invalid Server Response – The response to the blogger.getUsersBlogs method ......


• WordPress: Invalid response from blogger.getUsersBlog
  Description: On blogs running PHP 5.2.2, trying to configure the blog in Writer gives the following error: Invalid Server Response – The response to the blogger.getUsersBlog method received from the weblog server was invalid. / ......


• WordPress: Bad Behavior plugin doesn’t like Windows Live Writer
  Description: Blogs with the Bad Behavior plugin installed cannot be used with Windows Live Writer. Attempting to add the blog to Windows Live Writer results in a “403 (Forbidden)” error dialog. Reason and Solution: See this ......