Windowsxp restart itself- blue screen error

My xp have been restarting itself occasionally before, however in the past few days it has become a frequent problem, i already turned off the automatically restart option and on the blue screen this is what i get:

STOP: 0X00000050 (0XF9EDF0DA, 0X0000000, 0X804DABC3, 0X000000)

this message changed too, before the 0XF9EDF0DA was different but the other parts remains the same

any help would be high appreciated!
 
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