Hi Anjali,
Protocol Advisor utility does not support analyzing 64bit application.
From LoadRunner 11.50, LR supports recording 64 bit application for some protocol following this document:
http://support.openview.hp.com/selfsolve/document/KM00429332
As your application is Oracle 2 Tier so have you tried to record with Oracle 2 Tier protocol?
Regards,
Judy