My name is Clive and I work for the Social Media and Community Team at Dell. It appears that you need to know how to get the correct drivers for your webcam on Dell Studio XPS 1340. You can follow the steps below to get the compatible webcam drivers installed on your system.
Please click on the link https://smartsource.dell.com and select the country.
Then please click on continue and it will take you to a Sign in page.
Please click on create dell account and follow the onscreen instruction.
My Dell Downloads is an online software repository web site that allows customers to gain instant access to software titles originally purchased with their eligible system, proposed without media in the boxes.
I am sure that will help you to resolve the issue. In case this does not work would request you to call dell technical support and we would be glad to help you.