Why does trying to install a dual-boot 12.04 system give me "error 5: Input/Output error"?

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http://askubuntu.com – I am trying to install Ubuntu alongside Windows 7. I created three partitions (200MB for /boot, 3GB for swap, and 25GB for /). I am trying to install from the Live Image (USB or CD), and I keep getting error 5: Input/Output Error How do I diagnose what is causing this, and how can I fix it? (HowTos)