HP Pavilion (Atltac langsing)

Hi,
I was sold a laptop and they told me that it had a Europe keyboard attached, which it did, I was told also that it was a pavilion 5000, the laptop is in perfect condition well worth the money paid the only problem now is I need to change the keyboard from the one thats on it to a uk keyboard that I've purchased I would like detailed instructions on how this is done please then I can use the laptop,