Hello Shashi,
Windows Server 2012 is not supported in BO 4.0. You can check the PAM according to your version here.
http://www.sdn.sap.com/irj/boc/index?rid=/webcontent/uuid/e01d4e05-6ea5-2c10-1bb6-a8904ca76411
To my knowledge Windows Server 2012 is supported only in BO 4.1 which is still in Rampup.
Regards,
Mani