HT201210 I am trying to update Ios7 for iPhone 4 but there is an unknown error occurred like (-23). My Laptop OS is Windows 8. Now how can i solved this query.

Dear Sir/Madam
I am trying to update Ios7 for iPhone 4 but there is an unknown error occurred like (-23). My Laptop OS is Windows 08.ios 7 update which can updated and remaining 30minutes are left out. Than after error which can be show as i have mentioned above.
How can i resolved this error? So please help me.
Thanks & Regards,
Vatsal Desai

Error 20, 21, 23, 26, 28, 29, 34, 36, 37, 40
These errors typically occur when security software interferes with the restore and update process. Use the steps to troubleshoot security software issues to resolve this issue. In rare cases, these errors may be a hardware issue. If the errors persist on another computer, the device may need service.
Also, check your hosts file to verify that it's not blocking iTunes from communicating with the update server. See the steps under the heading "Blocked by configuration (Mac OS X / Windows) > Rebuild network information > Mac OS X > The hosts file may also be blocking the iTunes Store." If you have software used to perform unauthorized modifications to the iOS device, uninstall this software prior to editing the hosts file to prevent that software from automatically modifying the hosts file again on restart.
all of this from
iTunes: Specific update-and-restore error messages and advanced troubleshooting

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While the phone was plugged into my computer and iTunes is CLOSED.
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{The iPhone software update server could not be contacted. An unknown error occurred (-50)}. {Verbatim} -
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HT201210 I am trying to update Ios7 for iPhone 4 but there is an unknown error occurred like (-23). My Laptop OS is Windows 8. Now how can i solved this query.

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