Iphone failed to install now I can't restore it (Error 1)

I tried updating my iphone 4s to ios 7. But during the installation it said "installation failed" and on the iphone there was a sign that showed that I had to connect to itunes. I did and on itunes it said "phone needs to be restored" so I clicked "restore phone". But in the middle of that it said "iphone unit: iphone could not be restored an unknown error occured (1). If tried google it but most of the fixes I found online was only working for io6