I tried to download iOS7 to my iPhone 4, it put my phone into recovery mode and every time I try to restore it, it says it failed? HELP

I have an iPhone 4, I tried to download iOS 7 from iTunes tonight. I made sure my iTunes was up to date and everything, and while it was downloading iOS7 my screen went black and the iTunes symbol with the USB cord popped up onto it and in my iTunes tab, it said that it detected an iPhone in recovery mode and to restore/update it. I've tried it twice already, resetting my laptop twice and I don't know what to do someone please help!