nvlddmkm.sys and Bluescreen

I got a blue screen error when a computer was attempting to boot up, and amongst the error message was that the file nvlddmkm.sys had a problem.  Here is how it was resolved:

(You may need to do this in Safe Mode with Networking if you cannot boot to regular mode.)

Go to your C:\Windows\System32\drivers folder
Locate the file nvlddmkm.sys
Rename it to nvlddmkm.sys.old

Next go to nvidia.com and download the latest drivers for your graphic card and system

Go to the C:\Nvidia folder
Find the file nvlddmkm.sy_
Copy and paste it to the C:\Windows\System32 folder

Open a CMD (DOS) window
Type in: CD C:\Windows\System32 and hit Enter
Type in: expand.exe nvlddmkm.sy_ nvlddmkm.sys 
Hit Enter
Once the expansion is complete, go to the System32 folder and find the new file nvlddmkm.sys.  Copy it and paste it into the C:\Windows\System32\drivers folder.
Restart the computer.