When you start the System Restore utility in Windows Vista, the following error message may be displayed. The same error might occur when running Windows CompletePC Backup.

1 Click the
Pearl. The
Start Menu will appear.
2 Type
sysdm.cpl in the search box and press
.The
User Account Control window will prompt for permission to run the program.
3 Click
Continue.The
System Properties window appears.
4 Click the
System Protection tab.
5 Under
Automatic restore points, uncheck any invalid or duplicate location.
6 You may see two C: drives in the listing with the same Volume label. Deselect the checkbox for the duplicate volume, and enable the checkbox for the correct drive (the one with
Windows logo).

7 Click on
Apply and click
Ok.
Try this and let me know.