My machine has encountered a problem while creating a system image.

Hi,
My machine has encountered a problem while creating a system image.
It is indicating that one of the backup file could not be created. Look at the error message given below.
Please help.

Create a system image
The backup failed.
One of the backup files could not be created. (0x8078002A)
Additional Information:
The request could not be performed because of an IO device error. (0x8007045D)
