To undoing volume shadow copy to a previous state:
1. Open Computer Management. ( Click Start >Control Panel > Administrative Tools, and then double-click Computer Management)
2. In the console tree, right-click Shared Folders, select All Tasks, and then click Configure Shadow Copies in “Computer Management/System Tools/Shared Folders”
3. In the Shadow Copies dialog box, click the shadow copy that you want to revert to and click Revert.
CAUTION : a) To perform this procedure, you must be a member of the Administrators
group on the local computer
b) Shadow copies are not included in backups. Once they are deleted, they
cannot be restored.
NOTE: To avoid this, u must use the Revert button to revert an entire volume back to an earlier point in time. Reverting the entire volume will undo any changes that were made to files and folders on the volume since the selected snapshot was taken.
CAUTION: You should not use Revert on volumes that contain data stores like Active Directory or Exchange.
Hope it helps u !