That sucks, OP. One of my friends had this exact same problem. First thing first, this problem WON'T happen on Windows 7. We tested a dual boot of fresh installs, and his pc detected the gpu fine on 7 but not 8. Update your windows as much as you can, because this is a problem that reared its ugly head in the early days of Windows 8 release. I'm willing to be your computer contains an early RTM build, which appears to be one of the problems (since they're not updated as far as newer releases of the same build). If that doesn't work, disable optimus in your bios, and load safe mode with vga. This will force your laptop to use windows drivers on your nvidia card. Since it will now be recognized, you can go ahead and install the driver.