I don't think this kind of migration is officially tested. But, it maybe work.
Here are the brief steps:
1. install the Oracle 11.2.0.1 x64 on the 64bit platform
2. create the protect instance on the 64bit platform
3. copy the database files of protect on 32bit platform to the 64bit
4. create the listener on 64bit
5. change the JDBC connector on the Enforce to connect to the new 64bit Oracle