Hello ChinthakaDV7:
Welcome to HP's forum. You need to try this again. Please follow my examples. My computers are HP Touchsmart 600-1050 Windows 7 Ultimate 64 bit and HP Pavilion DV7t-7000CTO Windows 7 Ultimate 64 bit. Can you please turn over your your laptop remove the battery . Get a flash light so you can see your computer's information . It is in the battery compartment . Write it down Make , Model number and Windows operating system . Do not post the serial number. HP makes hundreds of HP DV7 computers. Each one has it's own software.
You can also try these keys a little white window will appear with your computer's information as wey. Press Ctrl, Alt, s May work. Remember no Serial numbers. Thank you frrw Soon as we have the complete computers information then we can point you in the right direction for getting your computer's software back. I am not posting this to be mean. This is a specific reguest of information you are asking for a certain computer.