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Your data’s trapped on a dead computer. You lost your login password. You never wrote down the product key on a non-working Windows installation. Your Mac won’t start.

Don’t pay the extortionists at the computer repair shop 800 bucks to get your data back or start up your dead computer. Plenty of free tools can help you and are available for download right now. Today we’ve got our top 10 system recovery picks which span operating systems but all cost the same: exactly nothing.

Which one of these tools is right for you depends on your skill level, operating system and particular problem. Do yourself a favor and burn yourself a disc with a couple of these before the terrible day when you need ‘em happens.

Lifehacker’s Top 10 Free System Recovery Tools

• 10. SuperDuper! (Mac boot drive maker)
• 9. Magical Jelly Bean Key Finder (Windows)
• 8. USB PC Repair Kit (Windows)
• 7. Undelete Plus (Windows file recovery)
• 6. System Information for Windows (diagnostics)
• 5. DasBoot (Mac boot CD maker)
• 4. Ophcrack Live CD (Windows password cracker)
• 3. Ultimate Boot CD (bootable diagnostic CD, x386)
• 2. Knoppix (bootable CD, x386)
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• http://lifehacker.com/software/lifehacker-top-10/lh-top-10–free-computer-system-recovery-tools-251903.php