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Depending on where you are in the process of trying to install Windows live essentials, there may be only one each of the registry keys I mentioned, or several in different places. Do a search in...

Reset cmos with the jumper on the motherboard. there should be instructions in the motherboard manual explaining where the jumper is and how to clear the cmos.

Might need to do the same to this key as well:
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Try this, locate the following registry keys:
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