Help and advice please. Everywhere I look on my pc tells me that I have 256mb of memory installed. I ran "Sandra"and that tells me the same but according to my pc spec. I should have 512mb.I have investigated inside the case and I have one x 512mb memory module installed in slot one on the motherboard. Could the module be malfunctioning or have I got some settings wrong. I have a Mesh pc with an Athlon xp 266mhz motherboard, an AMD Athlon xp 2000+ cpu (266mhz)and 512mb of pc2100 DDR memory.