replace security ID

We just rebooted and are seeing this ( replacing invalid security ID with default ID) I looked in google but am not sure how to handle this. If I stop the scan, what willl happen? What should I do? This is a major problem from my eyes.
Dennis MillerAsked:
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jimwassonConnect With a Mentor Commented:
Is this Windows 2000?

There is a KB article dealing with chkdsk doing this:;en-us;873437
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