Hi:
The reason there are no W7 drivers for your PC is because HP only provides drivers for older windows operating systems for their business PC's.
So what you have to do is to find a consumer model with the same hardware as the one you have, that came out before W8 came out.
Sometimes it is not possible to do this.
In your case, we can go to a few places and you should be all set.
Use the motherboard drivers from this model (audio, chipset, wired network).
DO NOT USE ANY BIOS OR FIRMWARE FILES FROM THIS LINK
Use this video driver:
Version 320.49 - WHQL
http://www.geforce.com/drivers/results/63458
Use this wireless card driver:
Use this BT software and driver: