Why does my Geforce/Nvidia Driver always vanish?

Fortunately I've figured out how to get it back, by searching for the specific driver manually instead of auto on Geforce site and then downloading it again. It's rather annoying to keep doing this though and even WoW lags really bad on low settings without the use of the Geforce/Nvidia one. Any solutions to this? Keep in mind I'm not very computer savy so there's an extent that I can follow some instructions. This question pertains to my Alienware 13 laptop, and to recap my Intel driver stays but Geforce Nvidia driver vanishes. Thanks in advance.