windows 8.1 with bing oem clean install x64

(apologize for bad grammar)
hi, im new here.. please help me if you has a solution for my problem,
my laptop is preinstalled with windows 8.1 with bing x64, i upgraded to windows 10 and found much disaster to my laptop, i want to revert back to my windows 8.1 with bing but the revert is cant because i make a clean install of windows 10... the question is where can i find the installation media for Windows 8.1 with Bing x64 and is it detect the oem key automatically after clean installation?

the second question:
my laptop keep freezing even not running any task(suddenly), mostly occur after startup
- make a format many times but same,, memtest passed.

if someone has a solution please help me. Thank You.

my spec:
preinstalled windows 8.1 with bing x64
proc: intel core i3 4030u 1.90Ghz
graphic:nvidia 820m 1gb vram
ram: preinstalled 2gb, added 4gb total 6gb of ram

You will NOT find Windows 8.1 BING edition for download anywhere..

Your only option now is to re-install windows 10

but, why my laptop keep freezing, normally occur after startup at the login and at desktop, even not running any task.
i make a format many time, after a week, it occur again and usually i make hard restart but nothing solved, keep freezing..

The only place I know of (officially) to get 8.1 with Bing is to order it from the manufacturer of your laptop. I can't even get that version on MSDN. I just hope I never need it because I don't have it. Where did you get your Windows 10 install media? It sounds like you may have corrupted install media of a hardware issue like a failing hard drive.

Since it appears your are kind of stuck with windows 10
Try installing the x86 Version of Windows 10
See how that works for you

Win10 ISO Download > Tech Bench