[post_ad]When i Double-click to open any folder then the folder is opening in new window. then you can do setting for Open Each Folder in same Windows 7.
Follows these Steps to Open Each Folder in Same Windows
1. Click on Start, then Click on My Computer to open Window explorer
2. Click on Organize tab, then Click on Folder and Search Option
3. Click on General Tab, then Click Open each folder in the same window radio button, then Click on OK.