iPod touch Ipod touch (8g) won't restore, It says i need to update but I already have!!!!!!

Please help, It has gone into recovery mode, and wouldn't restore, saying that I should check for updates as the current software wasn't available, I downloaded Itunes 9.1.1 but It still comes up with exactly the same problem, tried restarting, didn't work.

I have checked for more updates but it shows none??????

Any ideas anyone?? (working on macbook air)

thank you!!!

There's no error number it just says ' Software for this iphone is not currently available. Make sure you have the latest version of itunes and try again'

which i've done, its strange also that it says iphone but i don't know if that means anything??