Youngson, if I understand, you just need to install Workflow Solution Server on your server. Download the Workflow Solution installer here:

http://altiris.com/download.aspx

You need only to install the Server piece on your server. Then, make sure your server settings are right (configure through the task tray icon).

Does this solve your problem?

Stuper

This question was posted 4 months ago so I'm sure he has gotten an answer by now.  However, for anyone else who may stumble upon this and need an answer.....If I understood the question correctly, youngson was asking what he needed for a webserver.  Workflow publishes using IIS.  Instructions on installing IIS in Server 2k3 can be found at technet.microsoft.com/en-us/library/aa998483.aspx

I found this documentation by Chris Berninger very helpful. ( https://www-secure.symantec.com/connect/articles/workflow-65-installation-guide).  Check it out.