Step by Step process to integrate Nvidia and ATI drivers:

• Download Nvidia (or) AMD ATI drivers from respective official websites. For Nvidia click here and ATI click here
• Download RT Seven Lite latest version from here
• Download 7-zip from here
• Install RT Seven Lite and 7-zip
• Launch RT Seven Lite and Select your Windows 7 DVD and choose a image to integrate Nvidia or ATI graphics drivers
• Enable Integration task in RT Seven Lite and go to Integration drivers part in RT Seven Lite as below

• Now Extract the Nvidia or ATI drivers which you have downloaded using 7-zip as below

• After Extraction, you can see the files and folders as below

• Now go to RT Seven Lite drivers integration part and click "Add" button and import the .inf file from extracted directory. Check the screenshot below

• Select a INF file and will be added in list. Right click on a display driver and select "Install Image" option as below