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I am trying to format my new vostro 131 and have a clean window 7 installation. I have an external dvd-drive and I am booting the Operating system from that.  After I've selected Time & Language, Keyboard Layout (at the first step of installation), then I got the message "No device drivers were found. Make sure that the installation media contains the correct drivers, and the click ok" at the "Select the driver to be installed" screen (which is the second step of installation). I can open the Operation system DVD but I could not find anything to select. And I can not continue from there, what should I do ?  ps: my external dvd-drive needs 2 usb so I use usb 3.0 ports. Thank you
Select the driver to be installed (dell vostro v131)