When you restore a system partition/system state backup you will be prompted to restart your computer.
Thanks, Emanuel. That is clear now.
..One more question.
For example i backed up following objects on Windows XP (customized system state backup):
* Windows directory;
* Program Files folder;
* all critical files in the root folder (boot.ini etc)
* Documents and Settings folder EXCEPT "My documents" folder (which contains all my data).
If i would restore this backup what will happen to "My Documents" folder:
- either it will be blanked (as backup does not contain it)
- or it will not be touched by restoration process