is Peoplesoft Fiancials certified on Microsoft Windows x64 (64-bit) 2008,
I have done my own research and logged to the MOS portal to check for myself, this is documented here
Actually this is a Known issue and a KM document already exist
E-CERT: Finding a Certified Combination of PeopleTools, PeopleSoft Enterprise Applications, and Rdbms: an Example with Screenshots (Doc ID 1463015.1)