The problem is that support for you audio card is discontinued. And it looks like Microsoft doesn't have a standard driver for this card either.
What you may want to try is to install HD Audio Vista x64 driver on 7 in Vista compatibility mode.
Everest report shows that you have a notebook pc, so try searching your notebook manufacturer's site.
Your i915p onboard audio is Intel 82801FB ICH6 - High Definition Audio Controller