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lang-py
RegValueExists(Root, Key, '')checks for an existence of the default value in the key. I do not have that specific Python version installed. But checking the versions I do have installed, they indeed have the default value in theirInstallPathsubkeys. So it's quite possible that OP's code works in that particular respect. Otherwise, your code seems better in respect to testing Python installation. But I still believe you are not answering OP's question. Consider starting a new question about detecting Python installation and self-answer it. I'll be happy to upvote your posts then.