Windows Live Mail in doesn’t show contacts.

I have 6 identical HP machines in my office network all running Windows 8.  They have all been running Windows Essentials 2012 for the last 2 years, for Email, Calendar, and Contacts with no problems.  All machines are using the same *** Email address is removed for privacy *** account.  Recently one of the machines quit Displaying contacts. It will download the email headers but when you try to open the email it says there was a problem with the email.  You can login to other Hotmail accounts on this machine in essential mail and everything works properly.  On all my other machines when logged into essentials the account photo show up in the signed in area but not on this one machine, with this one account.  I have uninstalled, and re installed.  Deleted any associated registry keys. and still no luck.  Any Ideas?