Helo and happy new year,out there I have deleted my live camera drivers unknowingly I will like you to fix it for free,for me I have Dell inspiron 1721.thank you.

Head on over to Dell's site, enter your tag number and you will get a list of drivers.
Select the one you need and reinstall.

Dell drivers page: Drivers and Downloads | Dell [United States] (http://www.dell.com/support/drivers/us/en/19/DriversHome/NeedProductSelection)

Go to the Dell Website and download the drivers from there:
http://www.dell.com/support/drivers/us/en/19

First enter your OS so you get the right ones for the default page I found under Input (4) the "Laptop Integrated Webcam" (creative labs driver) and download then install and reboot the system. You might want to bookmark that page so you can get other drivers too.