HT1414 my iphone is frozen and when i am trying to restore the same it is giving error code 21 again and again

Please help my iphone is frozen and showing only apple sign, after following few tips for web it reached to itunes sign but every time i am trying to restore my iphone it is giving me an error code 21 ???

If your phone is frozen showing the Apple logo, you need to try to force it into recovery mode to restore it as discussed here:http://support.apple.com/kb/ht1808.  If you're getting error 21, try disabling or troubleshooting your security software (anti-virus, etc.).  This is Apple's discussion on error 21 (copied from http://support.apple.com/kb/TS3694#error21):
Error 20, 21, 23, 26, 28, 29, 34, 37
These errors typically occur when security software interferes with the restore and update process. FollowTroubleshooting 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.

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