Today when installing a virtual development environment for Sharepoint 2013 I got
“SharePoint Server 2013 encountered an error during setup”
error. When I checked the details of the error in error log file
I found an entry
“Failed to install the product: c:\global\oserver.msi error code: 1603(0x643) error when istalling sharepoint 2013”
I tried many different things but the solution was very interesting:) Virtual machine was using just one CPU. After increasing the processor on virtual machine from 1 to 4 magic happened and installation finished successfully.