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Backup archives won't validate in Windows

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I am running Vista on C drive and XP on D drive. These are the first two partitions of a 5 partition drive. I create my backup images on a totally different drive. Using Acronis True Image 2010, if I boot from the CD and create the images (one for C and one for D) then I can turn right around and validate both archives and they pass. But when I boot back into Windows and try to validate the same two backups, the validation fails. So I'm not really sure if the backup archives are any good or not. I had version 11 before and was having the same problem. I have Acronis scheduled to create a new backup of each operating system weekly. So far NONE of the archives pass validation in Windows. I really DO need to know if I have a valid backup if the need arises. The computer in question is a Pentium D 3.2 GHz with 2 Gb of ram. Memtest runs all night on it without any errors.
I have another computer that is set up pretty much the same way except it has Vista, XP, AND Windows 7. I have scheduled FULL backups of each operating system each week and all of those archives pass validation without any problems.
What is my problem with computer #1?

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Hello Ben,

Thank you for using Acronis True Image

Can you please clarify whether you save backup archive on internal or external drive? Have you tried to copy backup archive to different location and verify once again? Is the issue persists?

If there is a full backup and a chain of several incremental and differential backups to this full image and you are trying to validate or restore a differential backup it always fails if one of previous incremental or differential backups in this chain is deleted. So make sure all incremental/differential backup archives from the set are in the one location.

If the issue still persists please attach the last log file created within the software to your next reply.