Help me please! iPhone 4 fails to restore via iTunes, error code -1

okay, so i have an iphone 4 and i updated it to ios 6.1, it failed to do so and shows the arrow and asks to connect to itunes. im freaking out, because the last time i tried connecting to itunes, it restored my software, now i does not. it keeps showing error code -1.

i checked on apple website, it says it may be due to security settings and asked to turn off firewall. but my macbook pro has firewall off, also mine is a new phone, not jailbreak. ive tried everything. nothing works. there r hundred other threads out there on the same error... nothing works... i tried all...

help me someone... Pleaseeeeee