c'est bon j'ai trouvé la réponse sur un autre forum :
When creating VmWare virtual machine, bypass 'Easy install'.
Do not select neither 'Installer disk' nor 'Installer disk image'.
In opposite, select 'I will install operating system later'.
Later, attach disk image to CD drive manually (unless using physical CD disk),
select OS manually (Linux / CentOS) and power on the virtual machine. In this way
everything goes fine.