Hi Danor (Paul). Yes this version works fine. I have 2 x GTX 480 with SLI and it works (Alienware Area 51 ALX). I was originally on 260.99 from NVIDIA. 

You can upgrade directly from the drivers provided. If you do encounter problems be sure to remove all the NVIDIA drivers and reinstall 263.11. Note: In the custom install you can select a clean install as well. Use "Driver Sweeper" (v2.7.5) to ensure all the drivers/registry settings are removed this can be done from Safe Mode (F8) when you boot. I usually end up using "Driver Sweeper" to be sure some registry setting does not interfere with a successful install... 

266.35 is the lastest driver.

http://www.nvidia.com/object/win7-winvista-64bit-266.35-beta-driver.html

Thanks Sajin. I was keeping an eye to see the progress of this release (266.35). I guess where Paul was referring to is the official Dell release of drivers. So I personally will look to move to the new release from NVIDIA, but looked to see if the 263.11 from was an improvement on 260.99. Cheers.

I'm using the 266.35 version that Sajin recommended and they are working fine, I was having problems with my system locking up and at that time thought it might be drivers or bad card but Sanji noticed that my voltages where off and we worked on those and it has not locked up for a whole week where it was doing about eveytime it had a load on it, like going on the net or watching a dvd.

Paul