I recently reinstalled Windows 7 on my Inspiron 17R and the webcam wouldn't work.
After searching around I found this: http://www.dell.com/support/troubleshooting/us/en/19/KCS/KcsArticles/ArticleView?c=us&l=en&s=dhs&docid=266612 When I try and continue to step 2, I can't find Imaging devices
It advised me to contact support so here I am.
It's not a Dell copy of Windows 7, it's one bought from Microsoft