Quoted from NeoWin.Net: “So Windows 2003 Professional turned out to be a pipe dream, faster than we could get used to the idea being a reality it was played down/denied by Microsoft and all the knowledge base articles were removed to be corrected. It turned out to be an oversight. Well, we aren't ones to give up so easily at Neowin, so we have put together a guide that turns Windows Server 2003 into what we would rather call Windows 2003 Professional.“
Here's a reliable link to this great guide:
View: Windows 2003 as a Workstation Guide
Bob Baker