AsteriskNOW and installation GUI problem

Hi,
I have downloaded the AsteriskNOW iso and burned a cd.
I started the installation under VMWARE, configured the network,… but when the GUI installation start to copy packages (“transferring install image to hard drive” step), the installation exit from GUI and I receive the following messages:

Error loading new keyboard description
install exited abnormally
sending termination signals… done

Any idea ?

thanks
Luca