HT1414 I keep getting error 21 when I tried to restore my Iphone4.

Hi Everyone,
I kept getting this error 21 message everytime i tried to restore my iphone 4.
Everything started one morning my iphone 4 kept on vibrating and i really didnt know what to do.
So I unplugged it from charger. After that the screen went blank and everytime it keeps showing it to synchronize to itunes.
When I try to synchronize with itunes, Itunes is able to identify the iphone4 and wants to restore the Ios but unfortunately I keep getting this error 21.
and the process keep on repeating until now. I cannot use my iphone 4 anymore.
please help me.

Try disability your security software (anti-virus, etc.).  See http://support.apple.com/kb/TS3694#error21.

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