Hi:
There are no guarantees this will work but it should...
First, make your W8 recovery media before attempting to install W7. After you install W7, the recovery partition will most likely no longer work.
Next, you need to change a BIOS setting in order to install and run W7.
After you install W7, below are the links to the drivers you need and the order in which you need to install some of them for best results.
1. Install the Intel chipset driver and reboot.
2. Install the Intel graphics driver and reboot.
3. Install the nVidia graphics driver and reboot.
http://www.nvidia.com/download/driverResults.aspx/71706/en-us
4. See if the W8 audio driver from your notebook's support and driver page works. Then reboot.
If not, use this one.
Wired network driver...Install the second file on the list.
Wireless network driver...You want to download and install the second file on the list.
USB 3.0:
Intel Management Engine:
Card reader:
Webcam:
Protectsmart:
Quick Launch:
If there are any other drivers missing (listed under the Other Devices category in the device manager), click on them and then post the hardware ID for the device.
Use this guide for how to find the hardware ID.