OK, it looks like you have a reasonably well match set of DDR2, 333Mhz Samsung memory. So my first suggestion would be to use the system BIOS utility to set it according to specs, which according to CPU Z, is
333 Mhz frequency, 5 5 5 15 timings, and 1.80 voltage (you should probably double check the manufacturer's specs (sometimes they are written on the individual sticks, but can also generally be found on the manufacturer's website