heres my scenario, just updated the new driver for my GT740M. now cant play dark souls 2 nor any other games even if i installed the driver from my recovery disks. whats worse is that i cant open my nvidia contral panel even if my GPU is working properly ( from device manager status ) yet when i checked at dxdiag no GT740M appeared, only my intel HD4600 is available for use even though i disabled it .
heres my current laptop specs.
WIN8.1 64bit SL
ive used a driver sweeper and cleaned my nvidia and reinstalled my driver from recovery disk, or downloaded the old driver from nvidia website yet to no avail.
help help help.
need to level up my sorcerer at dark souls 2 hehehe
For those dual-graphics laptops, you almost NEED to use the drivers from the manufacturer, because they alter them just for that configuration, so i would say go to the manufacturer's website and get those, then see if it helps.
i say this because it sounds like the computer isn't detecting the dual graphics anymore, also you may want to disable any of the graphics drivers from windows update, as that can install the Intel ones, which also messes up the dual graphics "fragility".