If you notice nvlddmkm.sys errors on your computer, a bad driver could be at the root of the problem. This error occurs on systems containing the nVidia graphics card. It is likely that the error message you are seeing reads: "display driver nvlddmkm.sys stopped responding…" The primary cause of the error is one or more misplaced files. Fortunately, you can clear this error and restore your system with a few short procedures.
Press "Windows-E" to open File Explorer.
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Double-click the letter that corresponds to your primary hard drive--in this article, for the sake of example, we'll assume that your primary hard drive is "C:". Navigate to the following folder path:
Locate the "nvlddmkm.sys" file. Right-click the file and rename it "nvlddmkm.sys.old."
Click "This PC" in the File Explorer navigation pane. Click "Local Disk (C:)" in the right pane of the window.
Type "nvlddmkm.sy_" in the "Search this PC" field in the File Explorer window. Press "Enter."
Right-click the "nvlddmkm.sy_" file, and then click "Copy" on the pop-up menu.
Press "Windows-R" on the keyboard. Type "cmd" in the Run box and click "OK."
Type "chdir Desktop" at the command prompt. Press "Enter."
Type "expand -r nvlddmkm.sy_ nvlddmkm.sys" and press "Enter." Close the Command Prompt window.
Locate the file "nvlddmkm.sys" on your desktop. Right-click the file and click "Copy."
Press "Windows-E" to launch File Explorer again.
Navigate to the following folder path:
Press "Ctrl-V" to paste the nvlddmkm.sys file in the folder. Reboot your computer.