All the System Restore points can be cleared by disabling and enabling the System Restore option. However, Windows XP provides an option to clear all the System Restore points except the very recently created point. This can be accomplished through the Disk Cleanup Utility in XP.
Click Start, Run and type CLEANMGR and press Enter.
Select the hard disk partition and press OK.
At the top of the dialog, click the tab More Options.
Under System Restore section, click the button "Clean up..."
Now, all the System Restore points (except the recent one) are cleared and more hard disk space will be free.
