Blue screen error

I am wanting to know I have a MSI board and Athlon XP 1700 1.47 Ghz Chip the memory that I have is 512MB
Hard drive is 51GB
I have had the problem on and off coming up it would come up with a blue screen saying Error so I thought that I would reinstall windows XP SP 3 on it so I did that now all it will dos is go half way into windows and goes to a blue screen and in 2 sec it restarts I can not read what the blue screen says because it goes off real fast and then the computer restarts again.
I am just wanting to know if anybody has any ideas of why this computer is doing this?
Please give me some input.
 
Ble Screen

I have taken the memory chips out and swap them and also I took one out and left one in same thing blue screen.
 
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