Could not process the operation. The instance of SQL Server is running under WOW64 (Windows 32-bit on Windows 64-bit), which ...

Could not process the operation. The  instance of SQL Server is running under WOW64 (Windows 32-bit on Windows 64-bit), which does not support AlwaysOn Availability Groups.  Reinstall SQL Server in the native 64-bit edition, and re-enable AlwaysOn Availability Groups. Then, restart the SQL Server service, and retry the operation. For information about how to enable and disable AlwaysOn Availability Groups, see SQL Server Books Online.