Get "I/o Error" with the 0x8078002A error code when I start a backup.

* Original title: IO Error Message - I am an amateur

When I start a backup of my hard drive to my external hard drive, I get an error that reads "I/o Error" with the 0x8078002A error code.  I am a real novice.  I can do either fix it or work around this problem?

Hello

Welcome to the Microsoft community.

Try the steps in these articles:

Error message when you try to perform a full backup on a Windows Vista-based computer: "" the request could not be performed because of an i/o device error".
http://support.Microsoft.com/kb/952272
Note: It is applicable for Windows 7 as well.

Perform a clean boot:

How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7
http://support.Microsoft.com/kb/929135
Note: After a repair, be sure to set the computer to start as usual as mentioned in step 7 in the Knowledge Base article.

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