I can't update my ipad 2 ios 4.33 to ios 6

Hi there,
I have ipad 2 ios 4.33 and I want to update to ios 6, I am using Windows 8 and I have the latest Itunes installed, when I try to update my ipad using itunes it first makes a backup of my ipad, and the next step it extract the downloaded ios update, but then at the next step when it tries to install the update an error message appears :
" The ipad (my ipad name) cannot be restored at this time because the ipad software update server could not be contacted or temporarily unavailable "
I think it's error code 1638
Eventhough I am connected to the internet, and my antivirus and firewall are both closed....
I even uninstalled all the games and applications on my ipad!! and it still can't update.
Please help

Hello, wafaazeemi!
The following article has some relevant information regarding this error:
iTunes: Specific update-and-restore error messages and advanced troubleshooting
http://support.apple.com/kb/TS3694
Unable to contact the iOS software update server gs.apple.com
Error 1004, 1013, 1638, 3014, 3194: These errors may be the result of the connection to gs.apple.com being redirected or blocked. Follow these steps to resolve these errors:
Install the latest version of iTunes.
Check security software. Ensure that communication to gs.apple.com is allowed. Follow this article for assistance with security software. iTunes for Windows: Troubleshooting security software issues.
Check the hosts file. The restore will fail if there is an active entry to redirect gs.apple.com. FollowiTunes: Advanced iTunes Store troubleshooting to edit the hosts file or revert to a default hosts file. See section "Blocked by configuration: (Mac OS X/Windows) > Rebuild network information".
Try to restore from another known-good computer and network.
If the errors persist on another computer, the device may need service.
Best regards,
Allen

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