help required with installing windows 7 on my laptop

hello guys, i have received my customised laptop last week, i did order it without operation system as i need windows 7 to run 3D max and AutoCad and pcspecialist do not offer windows 7, i dont have much of ideas about computers but i have expert friend who tried every possible way of installing windows 7 and it didn't work with them, as far i understood during the installation of windows he the cant find the hard drives, did anyone experienced such problem, although pc specialist provided me with drivers for windows 7

below my laptop specs

Chassis & Display Defiance Series: 15.6" Matte Full HD IPS LED Widescreen (1920x1080)

Processor (CPU) Intel® Core™ i7 Quad Core Processor 6700HQ (2.6GHz, 3.5GHz Turbo)

Memory (RAM) 16GB HyperX IMPACT 2133MHz SODIMM DDR4 (2 x 8GB)

Graphics Card NVIDIA® GeForce® GTX 970M - 6.0GB DDR5 Video RAM - DirectX® 12

Memory - Hard Disk 500GB SERIAL ATA III 2.5" HARD DRIVE WITH 32MB CACHE (7,200rpm)

2nd Hard Disk 500GB SERIAL ATA III 2.5" HARD DRIVE WITH 32MB CACHE (7,200rpm)


M.2 SSD Drive 256GB SAMSUNG SM951 M.2, PCIe NVMe (up to 2150MB/R, 1260MB/W)
 
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