The error message appears when the folder to which The Windows error 1603 occurs when the user makes an attempt at installing the Microsoft Windows Installer package. So any ideas why this error would happen on Virtual Machines but not physical systems, using the same installation media? It happens no matter if I use a Domain Administrator account, or a local administrator account. The process fails in the same manner whether I try to install it from a Network Drive, or from a mounted ISO, or a mounted CD. It does have windows installer 4.5 on it. This Virtual Machine dos not have a previous version of Office on it, nor does it have any Anti-Virus just to test it out. Now I'm trying to deploy it on to a Virtual Machine (VMware), XP and Windows 7, and the installation fails, with the following error:Įrror: Failed to install product: C:\MSOCache\All Users\-C\ProPlusWW.msi ErrorCode: 1603(0圆43). I've downloaded the Office 2010 ISO from Technet and with it I was able to make a DVD and then install Office 2010 onto a system, XP and Windows 7, with no problems.