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I wanted to know if changing the following Registry entry will affect the behaviour of my PC: 

HKLM\System\CurrentControlSet\Enum\PCI[..]\HardwareID

If I changed this, would there be any "side"-effects (like, would Windows shut down)?

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Why would you want to do this? Hacking the registry is a sure way to cause all sorts of problems if you are not well versed on how to do it. – Moab Nov 14 '11 at 21:35
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You shouldn't do it. This is internal info used by the PlugPlay service to enumerate devices in our system. If you change it, it would no longer match physical hardware.

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Might cause windows to invalidate the installed product key also. – Moab Nov 14 '11 at 21:36
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