SQL Server 2005 provides a utility called DTS Migration Wizard to help you move your legacy DTS 2000 packages to SSIS format. It is not guaranteed to work perfectly, but it will make a best-effort attempt.
Initially, you may want to install DTS runtime on the SQL Server 2005 box so you can continue running DTS 2000 package as is. To do that, you need to run setup again. This is how you do that:
1. Run setup.exe;
2. After installing supporting files, configuration check, and other preparation work, you are presented with “Components to Install” screen. Click Advanced button;
3. Expand Client Components, then pick Legacy Components;
4. Proceed to finish setup.
However, the Legacy Components are not supported on 64-bit platforms. You will get the message below if you try:
“None of the selected features can be installed or upgraded. Setup cannot proceed since no effective change is being made to the machine. To continue, click Back and then select features to install. To exit SQL Server Setup, click Cancel.”
Bummer. You can get more information here regarding Integration Services considerations on 64-bit computers.