Is that an empty virtual disk you just created with qemu-img? If so, then that's only an empty partition that can't be booted. You must start QEMU with the option boot -d in order to boot from an autobooting CD (of your preferred distro or the like) from which you can then install an operating system to your virtual disk. Once installed, you may remove the option boot -d from your QEMU command line. If you don't use QEMU directly but via a front-end (I assume that's what Virtual Machine Manager is), there'll surely be an option somewhere to boot from your optical drive.
Last edited by JosipBroz; 12-14-2008 at 10:43 AM.