ok.. i edited my post above and in it i'm telling you:
uninstall this msn, install the previous version of msn that you had running before 7.0 again, and than upgrade it to the new one without uninstalling the old one first.
edit: also, try not to double post
you can use the edit button at the bottom of your post to add any new information
EDIT:
also try going
here
and
here
it may be due to a connection problem