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Yes you can re-install programs that are already on your computer. What happens depends on the installer. A good installer will automatically switch to maintenance mode if the version you are installing is the same as the one that is already installed -- allowing you to modify the installation (add or remove components). If there is no maintenance mode it should simply repair the installation if anything is missing, or let you know the software is already installed. If the versions are different, the installer should offer to remove the existing installation if it is older, or alert you if it is newer (typically you have to manually uninstall newer versions before installing older versions). A bad installer will simply install over the existing installation regardless, however the complexity of the software will determine if this is a good thing or not.

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Q: Can you reinstall a program if you already have it on your computer and if so will it do anything?
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