Right-click/select on trackpad not working

Hi

Basically the "right click" option on my trackpad has stopped working, I can't highlight sections of text or images, can't click and drag any items and can't resize windows or images. I'm going crazy does anyone know what's wrong? I called Apple and they didn't really help with anything, I've reset my preferences to default but no luck!

I can scroll with two/three/four fingers fine it's just when I want to click with two that nothing happens.

Any help would be greatly appreciated!

Alyssa