Start8 and ModernMix both did this to me after install as well. It takes quite a long time to reboot and it looks like it's installing a windows update. It hangs at 17% for what seems to be 10 minutes then reboots. The reboot also takes longer, but not as much. Subsequrnt reboots or restarts are normal.
I downloaded the software from the link sent to me and saved it to the hard drive before installing. So unless I had two coincidental windows updates right after installingstardock software, its the software in my case causing the issue, but its not a big deal as it is only a one time thing and worth the wait!
I have an i7 @ 3.2Ghz with 8GB ram, and it seems fairly slow, perhaps other configuration are slower?