I don't think there's much point for us to continue...
My advice to you is to try a different distro such as Mepis.
http://www.mepis.org/
The reason I suggest mepis is that on their main page there a press release that goes:
SimplyMEPIS 3.3.1-1 Maintenance Release
Submitted by warren on Fri, 06/10/2005 - 18:12. ISOs
Morgantown, WV, June 10, 2005: MEPIS has released a SimplyMEPIS 3.3.1-1 bootable CD. This is a maintenance release of SimplyMEPIS 3.3.1 to add the Traveller Disc feature when running from CD or performing a fresh install. Also autoconfiguration support has been added for new Intel and Nforce4 motherboards.
So they specifically state that they have support for Nforce4 motherboards which I think is what you need.