Try another driver to see if the issue resolves. Visit the link to laptopvideo2go in my sig, you can use official nVIDIA drivers with an INF from that site.

stu

I recommend the 56.63 drivers from the site stu suggested, don't try the beta drivers if you want to avoid trouble.

Thanks to both of you. Sorry to be so ignorant; when I get to that site, I'm not sure how to find the 56.63 driver you are referring to. I clicked on the Dell Laptop link and it shows something about a system bios download. Am I on the wrong link?  Also, why would I not just go to the nVidea website for the latest driver?  Thanks much!

You have to click on modded infs. I only added a driver version because many drivers shown there are beta versions which always have some problem. I suggested 56.63 because it's a mobile driver, if you want to get the latest nVidia driver, you have to take the 56.72. Doanload the driver and the corresponding modified inf file. The inf file is modified to support the mobile GPUs.
You cannot take them out-of-the-box from nVidia because they don't support mobile GPUs, so they don't install.