First try WLM in a new Windows account. If it's OK there, it's some setting. If it's wrong there also it's the program itself.
The usual advice with insolviable WLM issues is to ditch it and start using Thunderbird. But we're not there yet.
Windows Live Mail has suddenly started treating all my messages (both email and newsgroups) as file attachments rather than displaying them in the message pane. Why has this happened, and how do I get it back to normal?