The Ultimate Boot CD for Windows. Requires a licensed copy of Windows XP or Server 2k3 to construct, but afterward will contain scads of free or licensed tools for cleaning, repairing, or rescuing data from Windows systems.
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An excellent blog post on what to do if your MySQL database server isn't working right because an InnoDB table has been corrupted. I've used this process myself and it works like a charm. Knowledge of MySQL in particular and RDBMSes in general is required.