thanks for you help, it is a common fault with the pavillion laptops. First the wireless card is not reconised and cannot be installed. Then error message: operatin system not found and finally the screen stops working and the laptop does not boot up.
I have done the destructive recovery and installed xp service pack 3, all latest hp software and updated the bios and still i am having the same problem.
Hp said that they have to replace the motherboard and wireless card, i do not have to send the hard drive with the laptop, so will any of my information be accessable from any other part of the laptop?