Configuring / Change FC Quorum Model
As the quorum model has changed in Windows 2008 clustering here you can find more information’s how to configure the right quorum model in your cluster :
Failover Cluster Step-by-Step Guide: Configuring the Quorum in a Failover Cluster
https://technet.microsoft.com/en-us/library/cc770620.aspx#BKMK_steps_changing