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You know the situation; you’ve got problems with your computer, and need to reinstall it. However, you’ve got loads of software installed, and need the serial keys for them. What you need is a keyfinder. There are many out there, but the one I’ve found to be most useful is called the Magical Jelly Bean Keyfinder.
The keyfinder comes in a zipped file containing the program itself, a config file and a GPL. Once unzipped, simply run it, to see the serial keys it finds: