Have you tried their support? magicJack - Tech Chat Knowledgebase/FAQ
It sounds like that killing the process isn't sufficient enough to signal to 7 that device is 'done', so as far as 7 is concerned it's still 'active', hence the crash.
Quote: Originally Posted by nailgunner
That didn't make sense, so I tried it "again" and stopped the process and rebooting did make the error go away. I have tried a whole bunch of stuff over the last few days, including stopping the process a few times, but I may not have rebooted right after, because that does have the same effect as unplugging the device.
If you kill the process and don't reboot/shutdown straight away, there's a fair chance that the process is re-starting.