You have a computer on which Microsoft Windows XP with Service Pack 2 (SP2) is installed on the main partition. On this computer, you install Windows Vista on a different partition. Then, you try to use the System Configuration Utility (Msconfig.exe) in Windows Vista to remove or change the Windows XP startup option. However, the option is unavailable. You expect the option to be available on the Boot tab of the utility.

This problem does not occur if you install Windows Vista on both partitions.