Missing Two Drivers After Downgrading PC To Windows 7?

i Just purchased a HP Envy dv6t 7200 Quad Edition, which is not a Bad PC for HP but it came pre-installed with windows 8. i recently downgraded it to windows 7 and have been using most of the drivers from the HP Pavilion dv6t-7000 which came with windows 7 but i seem to be missing two drivers that i have not been able to find: One Unknown Driver one PCI Device Driver

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I know the unknown Driver may be hard to find but i was hoping to get some help in finding the PCI Device driver.Here are the specs of the laptop:

dv6t Quad
- Windows 8 64
- 3rd generation Intel(R) Core(TM) i7-3820QM Processor (2.7 GHz, 8MB L3 Cache)
- NVIDIA(R) GeForce(R) GT 650M Graphics with 2GB GDDR 5 video memory
- 12GB DDR3 System Memory (2 Dimm)
- 750GB 5400 rpm Hard Drive with HP ProtectSmart Hard Drive Protection
- 9 cell Lithium Ion Battery
- 15.6-inch diagonal Full HD Anti-glare LED-backlit Display (1920 x 1080)
- SuperMulti 8X DVD+/-R/RW with Double Layer Support
- HP TrueVision HD Webcam with integrated dual array digital microphone
- 802.11b/g/n WLAN
- Backlit Keyboard