PC keeps restarting, running XP Pro

Hi all
a month ago I bought a new PC that has: athlon x4 640, 4 gig RAM, 1TB hard disk and EAH 5450 1GB.
now from day one I'm having issues with the PC resulting in to BSOD ( I was using windows 7 then) so I thought it might be 7, that's why now I'm running XP. But on XP pro it always restarts on his own and when I start up it says windows had recovered from a serious error. I know absolutely know nothing about these things so I can't figure out what it is. I attached some of the minidump files I could find.

the error message: BBCode: 1000008e BCP1: C0000005 BCP2: 804EF76B BCP3: AA4608C BCP4: 00000000 OSVer: 5_1_2600 SP: 3_0 product: 256_1

I hope someone can help me
 

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