Frozen iPad during update via iTunes

hi,i tried to update my ipad through itunes on my desktop computer but it froze it .I now have a grey screen withthe apple logo .I did all the buittons onmy ipad and got to doing another update or restore .I chose restore ,everything was going okay until the itunes page dissapeared and the download froze on my ipad again.

[Re-Titled by Moderator]