Navigate to your C:\Windows\System32\drivers (assuming Windows is installed in C: with default path). Look for nvlddmkm.sys and hover your mouse over it. If this driver version number is different from the latest driver version (check www.nvidia.com), it needs to replaced. To do this:
1. Download the latest driver version (from www.nvidia.com) and extract the contents of the .exe file (this should happen when you double click on the .exe, if not, use 7zip to extract it).
2. Goto C:\Windows\System32\drivers, rename your current nvlddmkm.sys file to nvlddmkm.sys.old.
3. Look for nvlddmkm.sy_ in the folder where you extracted the latest drivers.
4. Copy nvlddmkm.sy_ to C:\Windows\System32\drivers folder.
5. Open command prompt in Administrator mode (start menu->programs->accessories->right click command prompt->Run as Administrator) if you have UAC enabled. If UAC is disabled just run command prompt.
6. Navigate to your C:\Windows\System32\drivers folder. (example cd C:\Windows\System32\drivers)
7. Type expand nvlddmkm.sy_ nvlddmkm.sys
8. Reboot computer.
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