How to Configure System Restore on Windows Vista

Configure System Restore Disk Space on Vista
1. Log in to the computer as an administrator and open the command prompt, available through the start menu.
2. Type in vssadmin /? and hit Enter to see a list of available options. The vssadmin command will engage a service called the Volume Shadow Copy Service.
3. View the amount of currently allotted disk space in use by the System Restore tool by entering the command 'vssadmin list shadowstorage' (without quotes) and hitting the Enter key.
4. Change the amount of space used by the System Restore tool by entering the follow command: 'vssadmin resize shadowstorage /on=[drive letter]: /For=[drive letter]: /Maxsize=[maximum size]' (without quotes).
5. Exit the command prompt. The maximum space usage allotted for the System Restore tool has now been modified.