Njanyana,
I finally got some time to play with NGS3, and solved your problem with EXOS v15.7.1...
The console was showing a
Warning. Could not determine the CPU Familymessage.
![85877121c7514bcc9a113a65508f9610_21775-fppbay_inline.png 85877121c7514bcc9a113a65508f9610_21775-fppbay_inline.png](/t5/image/serverpage/image-id/1994i29E32301635D745F/image-size/large?v=v2&px=999)
So, after some investigation on the start options for QEMU, I found that all that it takes is to add
-cpu core2duoin Advanced Settings - > Options.
![85877121c7514bcc9a113a65508f9610_22541-1n15489_inline.png 85877121c7514bcc9a113a65508f9610_22541-1n15489_inline.png](/t5/image/serverpage/image-id/173iB74A3AE74DFE315D/image-size/large?v=v2&px=999)
With that change the VM will boot without problems...