Mousepad not working properly

Hi,

I've got an Acer Aspire 5536, it has always worked fine until the weekend when the children got hold of it!

Now the mousepad doesn't work properly, you can move the cursor around without a problem but you can't click on anything by tapping the pad, you need to use the buttons underneath, I'm wondering if the children have managed to turn part of it off somehow?

Any ideas anyone?

Cheers

Steve