My trackpad doesn't work when keyboard is being used?

I searched around trying to find a solution for at least 2 hours yesterday, but I can't find anything.
The laptop I own is a Lenovo G50, the OS is Windows 8.1. It came with an ELAN trackpad.
I've tried just about everything I can find, disabling the trackpad delay, putting PalmTracking down to the minimum and explored around in my control panel. NOTHING has worked.
Please tell me how to fix this. It's really, really annoying.

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