When installing Spotlight on Oracle 4.0.x or 4.5.x, the following error occurs:
"Error 1721. There is a problem with this Windows Installer package. A program required for this install to complete could not be run. Contact your support personal or package vendor."
Refer to Microsoft Article ID: 891985 - "You may receive Error 1721 when you try to remove programs by using Add or Remove Programs in Windows XP" to resolve this issue: http://support.microsoft.com/default.aspx?scid=kb;en-us;891985.