You're telling me that I need to uninstall both drivers and then install the intel first?

It has nothing to do with the bios, sometimes it happens, sometimes it doesn't.
I found that after the error occurs if I disable to nvidia gpu first, enable it back, disable the intel gpu and enable...

I was running a modified bios on my laptop, flashed the same unmodified version and the code 43 is gone, the computer can now sleep.

And since yesterday GPU-Z does not show more than 64MB of memory being used while gaming, although games are running fine, could be I updated the drivers to 376.09.

Actually, both GPUs fail.
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I have an Acer Aspire 5742G with an i5-480M and a GT 540M and the Intel display driver fails whenever the computer turns the display off after 10min afk no matter what power plan I'm on, it hapenned...