Windows 7: Elan Touchpad not responding when tapping around edges

Hi
I used to have a synaptics touchpad but my space bar stopped working so sent my laptop for repair under warranty which they replaced 'the top housing'. and on return know have an Elan touchpad.



when tapping around the edges the only place it works is at positions 5,6 and 7 o clock.
when I got to the mouse device management elan options tab there is no option of sensitivity or anything to do with the edges.

I imagine it's some sort of safety feature against accidently tapping the ages but it's infuriating as i have discovered 90% of my tapping is along the right hand edge.
I have deleted and re installed the driver but with no luck.

Please help if you can.

Thanks

Gary