Hi guys, I don't know if this has already been answered in some other thread, but I am experiencing this issue. I downloaded Microsoft Office Professional 2003, extracted Service Pack 3 files to a separate folder, slipstreamed those files with that of Office Professional 2003 taking guidence from several guides available over internet, while all telling the same. Everything went fine, I got Setup for Office Professional 2003 with Service Pack 3 integrated. But when I tried to install using that Setup, it failed. When it reaches to "copying file: Microsoft.Office.Interop.InfoPath.SemiTrust.dll" it asks to insert Microsoft Office Professional Edition 2003 disk. I have even downloaded ISO for MS Office Pro 2003 with SP3 integrated by ETHO, but even that failed to install ended up showing same message. Note: the same Setup for Office Pro 2003 without SP3 being integrated, works fine. And I have also integrated SP3 to FrontPage, OneNote, Project Pro & Visio Pro, even they were installed without error.