Strange. Perhaps the demos are run on Intel graphics by default, if you have auto-switching graphics on your laptop. Try setting the default to the NVidia.
Or print all available extensions to see if everything looks right.
#include <fstream>
#include <string>
#include <algorithm>
#include <gl/gl.h>
...
wglMakeCurrent(hDC, hGLRC);
{
std::ofstream file("extensions.txt", std::ios::trunc);
file << glGetString(GL_VENDOR) << '\n' << glGetString(GL_VERSION) << "\n\n";
std::string str(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS)));
std::replace(str.begin(), str.end(), ' ', '\n');
file << str;
}
And if it's still missing make sure you have the latest drivers (nvidia.com).