Need to input either your HD 77xx GPU card to get the correct latest AMD Driver from here: AMD Drivers and Support for Radeon, Radeon Pro, FirePro, APU, CPU, Ryzen, desktops, laptops
You have four GPU 77xx cards to choose from(Desktop):
Edit: kingfish makes a good point. Here is the listings for Laptop drivers for the HD 77xx series GPUs:
Or if you are looking for your Motherboard's AMD CHIPSET at the same link as above : AMD Drivers and Support for Radeon, Radeon Pro, FirePro, APU, CPU, Ryzen, desktops, laptops