Boot errors since reverting to Windows 7 from 10

After upgrading to Windows 10, my computer started crashing while playing computer games.
Event log viewer showed: igfxcuiservice2.0.0.0
I also got an EM upon bootup to do with the video cards.
To save troubleshooting, I simply chose to revert to Windows 7 using the feature they included in the win 10 upgrade.

Since then, I can no longer boot at all (outside of safe mode). I get bluescreen EM:

*** STOP: 0x0000007E (0xFFFFFFFF80000003, FFFFF88003B4402D, 0xFFFFF880009a9328, 0xFFFFF880009A8B80)

Speck are as follows:
Acer laptop
Intel(R) core(TM) i3-4030u CPU @ 1.90 GHz
64 bit
Running Windows 7 service pack 1

NVIDIA GeForce 840 v
(also lists "standard VGA graphics adapter)

I think this is a video card issue but I'm not so sure how to proceed.
Thanks for your advice and help!

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Upgrade/down grade

Since it's unknown what either of these changed perhaps the quickest method is to spin in your last w7 backup.

If you don't have such a thing (why not?) then perhaps a factory restore.

Also look at the restore points windows has made see if any of those will get you back to a functioning machine.

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The clue is safe mode.

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