My motherboard is an ASUS K8N-E. I purchased a Nvidia 5500 series graphics card, but when I went to install the software CD, it stopped the progression of loading, it says, this card is not compatible with your hardware. The other hardware I can think of is the Samsung Write-Master, HDD Western Digital. Does anyone know what Nvidia card series would be compatible with my ASUS MB? I am using AMD 2.8 mhz, 1.5 MB RAM, plenty of disk space, Thank you..