In order to install SQL Loader you need first to install Oracle 11g Client on your machine.
1. after that invoke the OUI (Oracle Universal Installer) , you can see check the OUI in windows under starts—->programs—> Oracle Client. (Make sure to run OUI as “administrator“, by right clicking on the OUI).
2. Then Choose the file path where you want to install the SQL Loader in.
3. choose “custom” instillation type.
4. In “Available Product Component” list choose “Oracle Database Utilities” check box
5.Press next button to install this component.
the below image snapshots are used for visual illustration:
Then Choose “Custom”
Then Choose the appropriate path
Choose “Oracle Database Utilities” where Oracle SQL Loader is part of it.