Let me help you with this.
Please note the driver version 3517 is the latest driver for 2nd generation (HD 2000/HD 3000) and it is very important for me to say that this graphics controller does not support three monitors connected at the same time.
This configuration is supported on Ivy Bridge, Haswell and now Broadwell platforms. Here you can check more information about the 3 displays configuration:
When setting three monitor configurations, our drivers do support it but it is not only a software requirement but a hardware requirement.
Thank you for the assistance. I've read the FAQ's from the link you provided and found that the current processor (CPU: Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz) is not a processor product that is able to support three independent displays.