The Northwind and pubs can be installed from this Microsoft Web site.
After downloading SQL2000SampleDb.msi, extract the sample database scripts by double-clicking SQL2000SampleDb.msi. SQL2000SampleDb.msi will extract the database scripts and a Readme file into the folder C:\Program Files\SQL Server 2000 Sample Databases. Follow the instructions in the Readme file to run the installation scripts.