tried drivers from both intel and hp sites. I think that its a motherboard issue.
Finally shifted to Linux as i couldn't take the headache caused by the bright display. In linux too the laptop is getting too hot to hold and the battery life has not improved a bit from that of windows. I think that the intel hd graphics has broken as the fans runs vigorously even after installing all the drivers correctly. But atleast now I can use the system without getting any lags and headache.
Can you suggest some methods which I can utilise in order to fix the motherboard.
your help is greatly appreciated.