Unable to update ios7.1 in iphone 4S.Its throwing me 4016 error

I am trying to update my ios to 7.1 from one weeek its throwing me 4016 error all the time. I am trying this using itunes and I verified I have latest itunes in my laptop.

Hello there, Hima bindu tenneti.
The following Knowledge Base article offers up some great steps for troubleshooting your issue:
Resolve specific iTunes update and restore errors
http://support.apple.com/kb/ts3694
In your case the error message you have is found in this information:
Check USB connections
Related errors: 13, 14, 1600-1629, 1643-1650, 2000-2009, 4000, 4005, 4013, 4014, 4016, “invalid response,” and being prompted to restore again after a restore completes.
If there’s an issue with the USB port, cable, dock, or hub, or if the device becomes disconnected during restore, try troubleshooting the USB connection, then troubleshooting your security software.
To narrow down the issue, you can also change up your hardware:
Use another USB cable.
Plug your cable into a different USB port on your computer.
Try a different dock connector (or no dock).
Add (or remove) a USB hub between your device and computer.
Connect your computer directly to your Internet source, with no routers, hubs, or switches.
If you checked your connections and are still seeing the error message, check for hardware issues.
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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