system struck and showing read and write failure

[naniram@venkat]

i am using the laptop 'dell vostro a860' i got a problem when i switching the power button on its not working its booting but it not performing any operation and switching off itself ...................


but i got the dos prompt like bellow

'''memory write /read failure at 67262414,read 8926c926
expecting c920c926 to resolve this issue,try to reseat the memory
decreasing available memory

i am not good at finding the solutions ..so anybody please tell me what the problem exactly
and why it occurs .......what's the solution for the aboue problem.............please help me out here........