No, it has not been suggested that you reinstall Windows, you already did that on 9/26/2019, what you have not done is to reinstall the required Dell drivers, that is why the two links were provided How to Install Dell Drivers in the Correct Order and to obtain the correct drivers use the detect PC option here
In addition to the above, what I would suggest that you do first;
Get rid of this rubbish; Driver Booster **
Create a new system restore point.
Download and run DDU to get rid of all Nvidea related software that is presently on the computer.
And what I suggest that you do once you have this sorted, leave well alone and do not allow Windows or any other software download and install without your permission, Windows 10 in particular has a nasty habit of updating/installing driver updates that stuff up folks computers.
** You will not see anything like this recommended on any reputable forum, they are at best a gimmick and at worse a danger to the operating systems registry, it is an old article but the author is still highly respected and tbh Ive not seen it explained better than at the miekiemoes' Blog here
You are awesome, at the moment to tell you thw truth everything works perfectly dunno why, but at the moment i get BSOD i shall do the stepa you provided.
Truly the best help I ever received on any forum, much obliged.