Upgrade problem, dbus daemon cannot activate service "org.freedesktop.ModemManager"

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http://forums.fedoraforum.org – I was trying to update Fedora 14>15 via PreUpgrade. Anaconda was running fine, then after around 2000 upgrade items, it got stuck on the line at the bottom of the photo: "org.freedesktop.ModemManager". This repeats continuously, so I rebooted, but got a kernel panic when I tried to boot back into the old Fedora version (14). I also tried a rescue boot from DVD, and that failed. When I booted back into the upgrade, it completed a few more items (there were only 600 total this time, instead of around 2500) and then eventually got stuck on the same one again ("org.freedesktop.M (HowTos)