nvlddmkm.sys is nvidia graphic card driver files, first off download latest driver form nvidia official site..get it
here...use drop-down list to fill the model of your graphic card and OS..
If you can not boot from your system normally you can enter to safe mode instead, then remove all previous nvidia drivers that installed on your laptop, also you can do manually remove nvidia installations folder include 'nvlddmkm.sys'..You have need to restart your laptop to make changes then install new driver you have already downloaded...
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