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I have a Dell Inspiron 15R 5520.
It got a Windows 7 Home Basics 64Bit, Intel HD Graphics and an AMD Radeon HD 7670M Graphics Card.
One day in order to install the driver for AMD Catalyst downloaded from the internet I uninstalled the previous one. I had two options while ininstalling:
1. Uninstall just the Catalyst.
2. Uninstall all things related to the Catalyst as well.
I chose the second option.
I screwed myself.
After the uninstallation, the screen resolution become 800*600. I set it back to 1366*768.
Next, I installed the AMD Catalyst Driver. I got error that "catalyst cannot be started because their are no settings to configure."
So, I installed the AMD Driver again but this time from the old drivers. It worked fine.
Now I tried to install the Intel HD Graphics 4000 Driver that I had downloaded. It didn't install and I got the error that "driver cannot be installed because your computer doesn't meet the minimum requirements for installing the software."
Then I went to the Device Manager where under the Display Adapter I saw that I had both AMD and Intel HD Graphics Driver, but I knew that I didn't have the driver cause I am getting an FPS of 15 in Assassin's Creed III where as earlier I used to get more than 30.
In this case as well I tried to install the Intel driver from the old ones but I am getting the same error. All other things are working just fine, but the game is not.
