Purging System Restore in Windows Vista

How to purge System Restore in Windows Vista.

Note: This will delete any previously created restore points.

What to do

Go to Start|Control Panel|Backup and Restore Center.
On the left, select 'Create a restore point or change settings'.
In the window that opens, select the 'System Protection' tab.
Each available disk which is listed, has a checkbox alongside it. Deselect each of these checkboxes.
A new window is displayed, select 'Turn System Restore Off'.

This disables System Restore. You should then immediately re-enable it.

Another knowledgebase article describes how to purge system restore in Windows XP.

If you need more information or guidance, then please contact technical support.