Overclocking using nVidia's nTune application

Hi

I recently purchased a Gainward GeForce 8800 GTS 320MB (Golden Sample) and a Omega 600W Modular PSU. I Would like to overclock the GFX card using nVidia's nTune application as well as increase the GFX card's fan rotation speed. I Did research on nVidia's web site and found that nTune will be able to do so. I do have an Intel 915GAV (Avalon) motherboard. When I try to install it, it said that it requires a motheboard with an nForce 2 or 3 chipset, and then aborts installation. On the link on nVidia's web page is states that it works with all motherboards, but will only have GPU overclocking and GPU monitoring enabled, and not all the rest of the features, which I am happy about if it is the case. Can someone please shed some light on the situation as to how to get it installed. For reference, I have included the link to nVidia's web page below:

http://www.nvidia.com/object/sysutility.html

Thank you in advance