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.

Debra

I had the Lenovo G555 (3 video chip failures) and it had a trackpad that would make the cursor jump around when doing text typing. I used Trackpad Pal to turn it off. Lenovo is aware of the problem with trackpads on many of the ones they made 4 years ago. No cure.
Your problem sounds slightly different. Search Google again about it.

Starrysky

This is called PalmCheck. To disable this, go to Mouse Properties in Control Panel, select the Device Settings tab, select the Synaptics Clickpad or similar device in the list and click Settings, and under PalmCheck in PalmCheck-Enhanced, drag the slider down towards Off.

pup