It would have been best to follow gregrocker's post #6.
Using an image from another computer is going to have problems. Have you tried to activate the Product Code with Microsoft yet? You will probably need lots of new drivers
for your HP, starting with the chipset and networking.
If you don't want to download the Windows 7 SP1 .iso file and get a clean install as gregrocker gave you the link for, you can go to the HP support site and order replacement discs for your machine. The last I ordered were $16, but I will never use them now that I have downloaded a clean Windows 7 .iso file.