Restor problem on MAC OSX with my iOS devices

hi guys.
i've problem restore ios devices on snow leopard 10.6.8. itunes 10.5.3. i've iphone 4 (fw 5.0.1) , ipad 2 wifi (fw 5.0.1).
if make restore these devices, itunes still show me error message 21.
tried make restore dfu mode, show error 1600.
repaired permission, reinstalled itunes, turned off skype, ichat... , still same error.
started parallel win xp and... restore proceed on first time, no error message
can me? idea?
pls.
i'm unfortunate

thx replies

sorry english

 

ipad 2 under warranty. contact apple support.

 

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