Okay will try!
I got it to work again by replacing the "nvEncodeAPI.dll" found in "C:\Windows\SysWOW64" with one of the previous versions of the dll file. You will need to boot in to Safe Mode to replace the file, also be sure to back up the dll file your replacing.
Please Note: For advance users only. Also note this is only a workaround.
Note 2: Previous versions of the dll can be found in "C:\Windows\System32\DriverStore\FileRepository" in folders named "nv_disp.inf_amd64_neutral_"
Your method worked fine, the .dlls were in a different folder for me (C:\Windows\System32\DriverStore\FileRepository\nvmii.inf_amd64_045c4b7ce6da185d)All else fails try copy both "nvEncodeAPI.dll" & "nvEncodeAPI64.dll" to both System32 & SysWOW64