My IPhone wont turn on after updating

My Iphone 4G was updating to the latest i.OS software on itunes (on my windows computer). As usual, my phone had to restart. It turned off, but as it was turning on (when the screen just shows that silver apple logo) an error message came up on itunes saying that it couldnt update the software (I forgot to get the error number). But my phone is stuck with that silver apple logo on it. My computer tells me to restore my phone, which I tried, but everytime I do that, itunes says "extracting software" and then it says "preparing to restore" then it comes up with an error message (number 2009). I have tried restarting my computer. My phone is stuck like this. What should I do? Please help!