Im trying to run the first backup for a Win 7 box, 64-bit, and Windows Backup starts to run, then immediately stops with a message "check your backup, the last backup did not complete successfully" with Error Code: 0x80070003. This happens on a usb connected external drive that has been verified to work, and it happens if I choose what files to backup or let windows choose the files to backup.

Please try to install this Microsoft hotfix using this link and check if this solve your problem. Also, refer to this thread. This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration