Problem, a little slow but not un livable. The issue is the graphics on one of the screens almost always have lines or color blank spots in the graphics

PC:
HP/Compaq OEM AMD system with nVidia 6150LE chipset
2GB DDR2-667 memory
nVidia 7900gs PCI express Video Card with 256-mddr3 memory
Seagate 120-GB SATA-300 HardDrive


whats the biggest need of upgrading?