Problems with RAM. BSOD appears.

I have Samsung R25+ laptop with Intel Dual Core T2330 processor , 1gb of Samsung M4 70T2953EZ3-CE6 DDR2-667 SDRAM, ATI RD600/RS600 northbridge and Windows XP SP3 on it. I have added Transcend JM667QSJ-1G 1gb DDR2-667 SDRAM to the second slot and when i started my laptop the BSOD with 0х000000А and 0х0000008е errors appear. I would like to know what could be done in this situation.
