You must install Small Business Server 2000 Service Pack 1 before upgrading
Windows Small Business Server 2003 Setup cannot continue unless Small Business Server 2000 Service Pack 1 is installed.
You must cancel Setup, and then install the service pack. After installing the service pack, restart Setup.
Before installing a service pack, you should first back up your server. For more information about backing up Small Business Server 2000, see “Backup and Recovery for Small Business Server 2000” at the Microsoft TechNet Web site (http://go.microsoft.com/fwlink/?LinkId=12282).
If you have disconnected your Internet connection in preparation for completing Setup, you must reconnect it.
To install the Small Business Server 2000 Service Pack 1 by downloading from the Web
Disconnect your Internet connection device from the Internet. However, do not disconnect your server from the Internet connection device.
Disable any real-time antivirus programs that are running, as they may cause problems while running Setup.
Follow the instructions provided on the Web site for installing the service pack.
After completing Windows Small Business Server 2003 Setup, ensure that you enable any real-time antivirus programs that you disabled for Setup.