Because of security reasons the DomU will nog start on this type of machine. See :
'Xen will not allow creation of DomU on this CPU for security reasons. Pass "allow_unsafe" as boot option to Dom0,
when all the guest kernels are trusted or when creating new DomU's.'
So, what i did:
machine:/boot/grub/ vi menu.lst
Search for the title with Xen kernel and at ' allow_unsafe' after the kernel
kernel /xen.gz allow_unsafe
module /vmliniz-126.96.36.199-0.11-xen root=/dev/system/root