i m using outlook express 6 with yahoo mail. now whenever i hit  send/receive it downloads all mails starting from the day i created account. it is done everytime. need help if anyone can fix this?

add details if required
os windows xp sp2
servers pop3 and smtp for outgoing mail

i have windows xp sp2 v.2002 but with seven remix and i can't install windows live messenger in my computer , this message keep appear to me
((((( windows live messenger.exe is not a valid win32 application
plz help me ......
En el hotmail me sale todo en letras azules y no me deja acceder a nada, tengo 5 computadores con Windows XP SP2, memorias de 512. Agradezco me ayuden a resolver este problema.