revert LAN drivers to windows 7

Now the PC does not freezed with buzzed display

there is still one occasion, PC still hang.

So still need to monitor further



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Hope it is so simple that i revert the LAN driver

(also remove bluetooth dongle and extra keyboards)

Hope it will survive few more days or weeks

if still failed after CNY

then install 3e2bit windows 8.1

run ECS drivers

maybe will be looking to Window 8.1 tablet ...