Description of problem:
when I try to run some new downloaded ISOs with virt-manager, it says:

Unable to complete install: 'virDomainCreateLinux() failed internal error QEMU
quit during console startup
qemu: could not open disk image
/mnt/storage/software/linux/ISOs/openSUSE-11.0-KDE4-LiveCD-i386.iso

Details:

Unable to complete install '<class 'libvirt.libvirtError'>
virDomainCreateLinux() failed internal error QEMU quit during console startup
qemu: could not open disk image
/mnt/storage/software/linux/ISOs/openSUSE-11.0-KDE4-LiveCD-i386.iso

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/create.py", line 651, in do_install
    dom = guest.start_install(False, meter = meter)
  File "/usr/lib/python2.5/site-packages/virtinst/Guest.py", line 845, in
start_install
    return self._do_install(consolecb, meter)
  File "/usr/lib/python2.5/site-packages/virtinst/Guest.py", line 866, in
_do_install
    self.domain = self.conn.createLinux(install_xml, 0)
  File "/usr/lib/python2.5/site-packages/libvirt.py", line 833, in createLinux
    if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self)
libvirtError: virDomainCreateLinux() failed internal error QEMU quit during
console startup
qemu: could not open disk image
/mnt/storage/software/linux/ISOs/openSUSE-11.0-KDE4-LiveCD-i386.iso

Version-Release number of selected component (if applicable):

[dado@amelie ~]$ rpm -qi virt-manager qemu | grep -E "(Version|Release)"
Version     : 0.5.4                             Vendor: Fedora Project
Release     : 4.fc9                         Build Date: Fri 09 May 2008 08:21:13
PM CEST
Version     : 0.9.1                             Vendor: Fedora Project
Release     : 5.fc9                         Build Date: Mon 24 Mar 2008 10:32:08
PM CET

How reproducible:
Download a Live CD ISO, start virt-manager, connect to qemu and create the new VM.
  
Actual results:
The above error.

Expected results:
Created and running VM.

Additional info:
It could be related to https://bugzilla.redhat.com/show_bug.cgi?id=447808 but I
can't be sure. FWIW, this works on F8.