Nvidia just release a new driver moments ago.
Am downloading it now. Will update post later....

(quoting the official release notes)
Changes in Version 280.26
The following sections list the important changes and the most common issues resolved
since version 280.19. This list is only a subset of the total number of changes made in this
driver version. The NVIDIA bug number is provided for reference.
Windows Vista/Windows 7 64-bit Issues Resolved
Multi-GPU Issues
? [SLI], GeForce 500: Crysis 2– there is screen flickering when played in 2‐way SLI
mode, and ghosting when played in 3‐way SLI. [790223]



Hopefully that's true.

32bit Vista & Windows 7 http://www.nvidia.com/object/notebook-win7-winvista-280.26-whql-driver.html


64bit Vista & Windows 7 http://www.nvidia.com/object/notebook-win7-winvista-64bit-280.26-whql-driver.html


Release notes http://us.download.nvidia.com/Windows/280.26/280.26-Win7-WinVista-Notebook-Release-Notes.pdf