Trying to copy itunes library, receive device error I/O 0x8007045d

I'm trying to back up and copy my extensive library, rought 8,000 songs, to an external hard drive. Some songs copy, but then the copying slows down and i ultimately receive this error
"an unexpected error is keeping you from copying your file Error 0x8007045D. The request could not be performed because of an I/O device error"
The error is not in the external hard drive, I've had it checked. Running Windows 7 on a Toshiba Satellite A665 laptop.
Any ideas? This is extremely frustrating....
Thanks,

http://support.apple.com/kb/HT4527?viewlocale=en_US&locale=en_US

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For more information on this, take a look at:
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http://support.apple.com/kb/TS5376
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Uninstall iTunes and all of its related components.
Reboot your computer. If you can't uninstall a piece of Apple software, try using the Microsoft Program Install and Uninstall Utility.
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Trying to copy itunes library, receive device error I/O 0x8007045d

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