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fatal system error

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Once i am in the middle of doing something the computer turns blue and says fatal system error

it is c000021a (0x00000000 0x00000000)
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That error sometimes indicates bad RAM. Download this much-used memory tester: http://www.memtest86.com/
You can create a boot floppy of it on a working PC, then boot the 'poorly' PC with it and run the test. Be sure to read the instructions file that comes with it to avoid false readings.
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