Microsoft has released
a Volume Shadow Copy Services (VSS) update in the following operating
system versions:
- Windows 2003 update rollup
package KB940349
- Windows Vista Service
Pack 1
This new VSS fix packages causes VSS to generates .xml control
files in a format which is not compatible with the earlier versions
of VSS. This error can occur when a system state restore is being
performed from a base operating system level which does not have the
VSS fixes applied and the system state backup files were created by
an operating system level that did have the VSS fixes applied.