Hi,
Put the stick RouterOS 5.12. Level number 1 (DEMO).
When you turn on the KVM and the indication cdrom writes "no disk image"
On the CD recorded .ISO of Ubuntu.

CPU Intel i5 2500K
Math. ASUS P8P67.

Help me.

can you show your kvm configuration here ?

using level1 license it is not possible to use KVM to create guests in RouterOS.