Well, since the recently released 195.62 WHQL mobile driver was another FAIL, I grabbed the SLI Profiles and have updated my modded batch updater. Again, this is to be used if you are having issues with enabling SLI on newer game releases with your current driver.
I have tested this under Vista 64 and using driver 186.82. Works perfectly. I have no issues at all with L4D2 and SLI is fully enabled. COD:MW2 - no issues either.
As an alternative, you can also use nHancer however I prefer to stick with the NVIDIA Control Panel.
You can grab the batch update HERE.
Be sure to read the IMPORTANT - README file for notes.