HELP! physical dump memory

[nani_amb]

hi.. i need some help on my pc. i'm running windows xp, actually playing Command & Conquer Red Alert 2 when suddenly the screen goes blue having PHYSICAL_DUMP_MEMORY last line of the message. when i restarted, i only have black screen (the monitor's power indicator blinking). the processor's & casing fan is working..what should i do..? please help..

K7VTA2 motherboard
AMD Athlon(XP) +1500
NVIDIA GeForce4 MX 4400
256Mb DDR PC-266
40GB Seagate HDD (Master)
20GB Matrox (Slave)

i really need help on this..