There's 2 different kinds of gpus. There's the integrated gpu (igpu) that's actually part of the cpu processor. The other kind is a discrete or dedicated gpu (gpu) that's either an add in card or built into the laptop separately from the cpu. If you have the first kind, it's not nvidia, it's an intel (or AMD) HD, so there is no nvidia control panel, everything just gets run through the OS screens for display adapters, personalization etc when you click on the screen. If you have the second kind, your bios will already be setup for the gpu, so unless the gpu actually has gone bad, it'll automatically be recognized. Laptops are a little different than desktops in that most gpus can't really be switched out easily, if at all, requiring you to take most of the laptop apart.
So, if you can't open nvidia control panel because you aren't attached to an nvidia gpu (which is entirely different from windows control panel) it's one of 2 things. Either you have an intel (or AMD) HD igpu or the gpu is bad and is not recognizing its actually there.