Virus and Spyware Protection Def out of date

We have the latest version of the server console and clients running at 12.1.2015.2015 , 30% of the clients are updating their antivirus definitions and the rest of the machines are not. They all seem to be stuck on april 12th update and wont update past that. even when running a manual intelligentupdater it fails. I have tried to reinstall the clients but it just wont take.I have the  Intelligentupdater txt , syslog , and settings .live log files from the client. The machines are windows xp 32 bit and are being managed.