Hi,
this is a newsgroup for Messenger for Mac; we won't be able to help you!
:-(
You might be better off asking that question in a newsgroup dedicated to
Windows Live Messenger.

Signature
Michel Bintener
Microsoft MVP
Office:Mac (Entourage & Word)
***Always reply to the newsgroup.***
> Sometime ago I posted about problems installing MSN messenger and error
> message saying Application failed to initialize properly (0xc0000005). I have
[quoted text clipped - 4 lines]
> have a Dell Inspiron 6400. There has to be a reason why I am only able to
> install version 5.1