MSN email

My OS is win 7 prof 64 bit and I use MSN email, and access the email thru their web site.   All of a sudden and suddenly, although I can go to the site, login, and go to the inbox, but cannot view the email even when clicking on it.  By the site of the tab, I see a Microsoft  tab, which says identified by verisite.  After repeatedly trying, I managed to get to see the emails one time, but more often I cannot.  i had run a malware scan, and it did not show any thing serious and anything that showed up was deleted.  I have Norton's security on the pc.  Hope the Experts can advice what is happening and the suggestged fixes.  Thank u.