|"yeah have tested the memory, it passed but failed on the hard disc"|
If you ran a proper hard drive manufacturer's diagnostics test and it failed that, the hard drive must be replaced before you do, or he does, anything else..
If you do not have any Recovery disks that came with the computer, or that you made yourself previously by using a HP supplied program already on the hard drive, you or he may be able to buy a Recovery disk set for your model from the HP web site. If one is available, it's listed in the software downloads for your specific model on the HP web site.
It's relatively cheap to buy.
If you don't or he doesn't know what the specific model is...
Scroll down a bit.
Find the similar label on the outside of the case.
- the specific model number - at the end of the first line
- the Product Number - p/n - on the third line