Verify each of the following, make any necessary corrections, and try the installation again:
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You are installing the product on the correct server in the farm, as listed in the Setup program. See Location of Install Files for more information.
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The installation account has the correct permissions, as listed in the Setup program. See Required Installation Permissions for more information.
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You are following the Recommendations for a successful intstall.
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You are following any specific instructions provided in the Installing the Product section of the Online Documentation for your product.