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You might be able to check the event log but I'm not sure if it would clear that out or not.
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You might be able to check the event log but I'm not sure if it would clear that out or not.

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Why do you want to know when sysprep was run?
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Why do you want to know when sysprep was run?

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I don't think that matters.<br />
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Anyways, I found it myself... HKLM\System\Setup\CloneTag<wbr />
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I don't think that matters.

Anyways, I found it myself... HKLM\System\Setup\CloneTag

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What is the registry key / method to verify when sysprep was ran on a unit?
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What is the registry key / method to verify when sysprep was ran on a unit?

When sysprep ran?

Microsoft Windows XP is the sixth release of the NT series of operating systems, and was the first to be marketed in a variety of editions: XP Home and XP Professional, designed for business and power users. The advanced features in XP Professional are generally disabled in Home Edition, but are there and can be activated. There were two 64-bit editions, an embedded edition and a tablet edition.