Physical memory dump

Hey guys, recently I've been having this problem. Whenever I do more stuff at once, like, playing a game and listening to music, copying files, etc, and even at random, when I'm not doing much, I've been getting a BSOD (Physical Memory Dump). Can anyone help me?

My configuration is:
AMD A780L Motherboard
AMD Athlon 7450 Dual-Core 2.40GHz
4GB RAM
NVIDIA GeForce 9800 GT
Windows 7 Ultimate 64 bit
 
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