Need to install Oracle Express 11g Release 2 on a Windows 7 64-bit laptop
For that purpose you can download the pre-built virtual Machines (VMs) provided by Oracle. They only need Oracle Virtual Box in order to check them out (https://www.virtualbox.org/wiki/Downloads). 

You can download them here:
http://www.oracle.com/technetwork/community/developer-vm/index.html

This is the best solution for learning Oracle DB, without actually messing up your system.