All of your Windows Live Mail account settings, email, RSS feeds, atc. are stored in the following locations:

Windows XP: C:\Documents and Settings\<your Windows username>\Local Settings\Application Data\Microsoft\Windows Live Mail

Windows 7: C:\Users\<your Windows username>\AppData\Local\Microsoft\Windows Live Mail

Copy the Windows Live Mail folder over before launching Windows Live Mail, replacing any existing Windows Live Mail that may be there, and your accounts/emails should appear within the application. Just note that those directories are hidden by default, so you'll need to type them in manually or enable the viewing of hidden folders/files.

Hope this helps,