I received the same error; when I visit the Majic Jack forum, it says that basically this error is due to a windows Firewall. I disabled my firewall, so that does not seem to be the problem; I also have several monitors, which may be interfering with my interrupt settings and ports.
I am sure if I put my computer back to an earlier date, it would correct everything, but I may lose data I have, as I have not backed up everything, nor do I feel like it. =)
So what I am saying is try to disable your firewall and see if that works. Meanwhile, I am trying to find an answer myself.
They pushed out an update today, your firewall needs to allow the update through. I already had an exception in Windows Firewall for MagicJack, but had to delete and re-create it to get it to work. You might have Windows Firewall along with another firewall too.