WinXP problematic with MSN 4.7

i hate MSN Messenger 4.7

so i got rid of it and also put MSN 5.0 on

had to change some stuff in registry

anyways
now my Outlook Express take 40 secs to load
i didnt back up registry because i was sure that it would be no problems
but it seems outlook express doesnt like it

anyways
any way to get outlook express totaly linked to MSN 5.0?