I tried to install Windows 7 on a HP dv6510us and found no drivers available for this machine. HP and other places did not find the driver so it was rolled back to XP per this guide -> http://www.fastfs.com/help_pages/hp%20downgrade.htm

My friend who was trying this spent about a month trying to find all the Windows 7 drivers (failed) and then didn't want to live with Vista so tried to go to XP and failed. Finally they begged to have me do the deed. I used that link to get XP working as good as could be expected.

I'd save your Windows 7 license for another machine.
Bob