To modify the default operation of double click on folder follow these steps:
- Click on My Computer.
- Select Folder Options... from Tools menu on the top.
- Click on File Types tab on the top.
- Select Folder from the list and click on Advanced button.
- Select the action from the list you want to make as default action for double click.
- Click Set Default and then click Ok and go back.
- Close all the windows and try if it works.