Sorry to hear about the big problems, and thanks very much for posting all these details and for attaching the dxDiag results!
Sounds like restore point you reverted to is
possibly more recent than when you installed the PD16 patch. If that's the case, then the 3424 patch wasn't what did you in. It's also possible that something did go wrong with 3424
or that the recent restore process damaged your PD16 installation.
My first thought is to uninstall PD and remove all user preferences if you're prompted for that, then install PD again. Obviously don't add the patch yet. Make sure everything is good, and confirm that a new restore point has been created. You can manually create one if needed.
Next, go to the Dell support website for your Precision M4700 and see if the
Diagnostics app will run. Let it apply the most recent updates. Your DxDiag results DO NOT SHOW any nVidia card present, and hopefully the diagnostics app will help with that.
If not, go to Win7's Device Manager and see if the nVidia card has a yellow exclamation point next to it. You'll want to Google for solutions, and then make sure you have the most recent driver for it from the
Precision M4700 driver page. You'll also want to get the latest Intel video driver, as yours dates from 2016 and the current one is from Jan 2109.
Once you have you nVidia card working and all drivers are up to date, make a final restore point and
then apply the 3424 patch. Hopefully things will work better this time!
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