Click this link here:
Select your operating system HP Pavilion dv2819nr Entertainment Notebook PC
Then try the Vista drivers, picking either 32bit or 64bit depending on which Windows 7 you have running. (32 or 64 bit version of windows that is)
If you dont know which version of windows, right-click 'Computer' on the desktop, go properties and see which it says. (see the attached picture)
If it says '32 Bit Operating System' or '64 Bit Capable' (not '
64 bit Operating System') then you need the 32 bit drivers.