I have alocated all the options available from 1 gig to 8. But of course I can't use 8 as there would be none left for the host. I have also tried from 1 to 3 CPUs / cores.
I have tried win 7 iso, win10 iso, server 2016 ios. It just will not start. It's like it the VM can't see the host info, although it is displayed under the host info area (4 cores and 8gig RAM)