Symantec Endpoint Protection only pushing virus Defs to 32 bit clients and not to 64 bit

We have been having an issue with pushing Virus Definitions out to our users.  All 64 bit clients are out of date.  But all of our 32 bit clients have received the most current definition.  We are running Microsoft Server 2008 (64 Bit) and all of our clients with the exception of 15 are running Windows 7 (64 bit) the 15 that have received the update are running Windows 7 (32 bit)  Any help or guidance would be appreciated.