hello all

I just bought my new iphone 4 and as taken for granted has since jailbroken it. it is a 4.1 OS 4G
but after I played with it stopped some of the features which allows jailbreak. like everything inside of themes. so therefore I chose to restore.
I throw it to the latest vision of itunes and set it started to restore.
middle of it all is it just stalled. it does not move and has now completed for 12 hours without moving. I've tried to restart several times but always with the same result.

can anyone help me?