XP and a Touchpad

[HereThereandEverywhere]

Hi, my cousin's laptop, which I installed XP on, is running XP. It's an HP N3290. It has a touchpad, but the right mouse button UNDERNEATH (meaning towards the user) the touchpad isn't working. I was wondering how I could enable this? There's no driver for XP on the HP site, so I was wondering if any laptop users could help me out with this? Thanks in advance.

 

[Icemave]

I have a Dell Inspirion 8000 with XP loaded and do not have an issue with the above. To me it sounds weird the other button works but not this one.