I sympathize. I have the same issue........ trying to install Win 7 on a HP 1000 that came pre-installed with Win 8.
Finding the drivers for the AMD A68M FCH chipset has proved surprisingly painful. Both the HP and AMD websites being fairly useless.
The key is to find the ethernet LAN driver. Once you have that working and you can connect you can use Windows update to pull down the graphics drivers and everything else.
If I find the LAN driver I will come back to you.