Im sad to say the original install of windows 8 is gone. cant boot into it or repair it. it happened one of the first times i tried to install win7 and back then it did see the drives, i tried to install into c and deleted the rest. :(
the only thing specified at hp regarding this laptop and its drive "1 TB 5400 rpm SATA
Partitioned up to 24 GB for recovery" and "Intel HM77 Express"
This seem to be the original drivers (windows 8) for this model, maybe it can give a clue?