Hi All, I am actually creating a redistribuable windows xp cd-rom, which also install Office 2k3, .Net and so on and I found a explanation about the problem with the "Microsoft.Office.Interop.Infopath.SemiTrust.dll". Actually, you will get prompt to insert the Office CD-ROM if you install Office 2003 after the .Net Framework. To correct this, you just need to install Office first, and only then the .Net Package.