Q: I have been trying to restore my iphone 4s for 5 hours, please help! The update wouldn't work and now when I connect the iphone it says I have to resore in order to start using itunes but I am getting an error msg. HELP!

I am trying to update a 4s. The update did not work for some reason. Now I need to restore the iPhone. When I connect the usb to the computer and phone it says I need to restore. So, I click to restore. It starts extracting the software. But I am continually getting the same error message that it cannot complete for unknown error. I have been working on this for 5 and a half hours. I'm tired, mu husband needs his phone and apple support is a joke and of course I can't find any answers anywhere. Please help!