Cannot reinstall a program?

A friend of mine is trying to reinstall a game and they run into an issue where the computer says it can't install it since it's already installed. This, however, isn't true. The program was uninstalled from Add/Remove Programs, the program files were deleted, and the related registry keys found were deleted. Rebooting after that results in the same error.

Does anyone have an idea about how to go about fixing this besides reformatting? Or perhaps a workaround even if it's not perfect?

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  1. You must have missed one or more program files. Possibly there a file that was generated with registration/activation. Set the computer to show Hidden files and folders and check in Documents Settings under the user name under which it was stalled and Check in both Application folders would be a good place to start. I don't see how the computer could think the program was installed unless there were game files installed.
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