Can not restore non jailbroken iphone 4 to ios 7.1

I was using ios 6.1.3 on my iphone 4 8gb.
Then i thought to update to ios7.1 since i heard that 7.1 is bit faster than 7.0.
So i downloaded the ipsw for ipswdownloader.com.
The problem is i can not restore it from itunes.
The restore process started and at the last got an error 14.
Now i tried thrice but still getting error 14.
Can not solve this.
Please help me.
My device now has stuck on connect to itunes.
Its not starting .
Pls do help

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